Biology Questions and Answers Form 2 - Biology Form Two Notes

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Biology Questions and Answers Form 2
KCSE Revision Questions and Answers

Biology Notes Form 2

1. a) i) Define transport

Movement of substances from one pan of the body to another

ii) Explain the necessity of transport in plants and animals

make nutrients move from one point to another

movement of respiratory gases i.e. oxygen and carbon IV oxide

elimination of metabolic wastes

movement of hormones

movement of water

movement of salts

movement of enzymes

b) i) Describe the structure and function of root hair

root hairs are found near the root tip

they are cells with elongated ﬁnger-like projections which are in contact with soil particles

they are permeable to water and mineral salts hence are used to absorb Water and mineral salts

There large number offers a large surface area for absorption of water and mineral salts.

ii) State ways in which the root hairs are adapted to their functions

the root hair is long/narrow/numerous to increase surface area for absorption of water and mineral salts

many mitochondria in cytoplasm to supply energy for active transport of mineral salts

are thin walled to speed up rate of absorption of Water and mineral salts

c) i) Compare the internal structure of a dicotyledonous root and a monocotyledonous root

Monocot root

ii) State the similarities and differences between a dicotyledonous and monocotyledonous root

Similarities

both used for anchorage and absorption of water and mineral salts

both have root hairs, epidermis, pericycle, cortex, endodermis and vascular bundles

(xylem and phloem)

both may be used to store food/storage organs

Differences

Monocotyledonous

phloem and xylem are arranged in ring form alternately

pith present

Dicotyledonous

phloem lies between radial rays of central xylem(star shaped)

pith absent

iii) Compare the internal structure of a monocotyledonous and dicotyledonous stem

Monocotyledonous stem

Dicotyledonous stem

i) Give the similarities and differences between a monocotyledonous and dicotyledonous stem

Similarities

both are used for protection

both conduct water, salts and food

both have epidermis, cortex, pericycle and vascular bundles

Differences

Monocotyledonous

vascular bundles are many and scattered

some have hollow pith or pith is absent

no cambium layer therefore cannot

undergo secondary growth very

little cortex

Dicotyledonous

vascular bundles are few and arranged in a concentric ring near the epidermis

pith large and well developed

State the differences between the internal structure of a root and a stem.

no cambium layer therefore cannot

undergo secondary growth

very little cortex

presence of cambium therefore

undergoes secondary growth

cortex has several layers of cells

c) i) Name the transport structures of a flowering plant

xylem vessels and tracheids transport water and mineral salts from the soil

Phloem vessels translocate manufactured food from leaves to other parts of the body

ii) State the ways in which xylem vessels are adapted to their function

lignified/thickened to prevent collapsing

narrow to facilitate capillary

no cross walls for continuous ﬂow/column of water

have bordered pits for lateral movement of water

a) i) Why do ﬂowering plants need water?

photosynthesis

transport

turgidity w h helps in plant support

solvent i.e. medium for chemical reactions

cooling effect during transpiration

seed germination

ii) Describe the movement of water from the soil to the leaves of a tall plant

Soil water exists as a thin film in the soil, between soil particles

the concentration of cell sap of root hair is greater than that of the surrounding solution in the soil, thus drawing the Water molecules across the cell wall and cell membrane into the root hair by osmosis

water drawn into the root hair cell dilutes the cell sap making it less concentrated than that in the adjacent cortex cells of the root

due to osmotic gradient water moves from the root hair cells into the cortex by osmosis, from cell to cell by osmosis, across the endodermis by active transport into xylem vessels of the root that conduct water into xylem vessels of the stem into xylem vessels of the leaves

Stem

Once in the stem water moves up the plant aided by the narrowness of the xylem vessels (capillary), root pressure, attraction of water molecules to each other (cohesion).

Attraction of water molecules to the Walls (adhesion) from the stem water enters the xylem of leaves

water moves in the xylem vessels of the stem in a continuous (uninterrupted) water column up to the tree leaves

Leaves

once in the leaves water moves into the mesophyll cells by osmosis as water vaporizes from the spongy mesophyll cells their sap becomes more concentrated than the adjacent cells as the result water flows into the cell from other surrounding cells which in turn takes in water from xylem vessels within the leaf veins this creates a pull(suction force) called transpiration pull that pulls a stream of water from xylem vessels in the stem and roots .

The transpiration pull maintains a continuous column of water from the roots to the leaves.

iii) Name the process by which mineral salts enter into a plant

active transport

diffusion

i) Explain the forces that make water and mineral salts move through a plant

mineral salts are taken up due to diffusion because of the concentration gradient between the mineral ions in sap and those in soil solution

active transport involves energy in form of ATP due to respiration which forces mineral salts through a plant against a concentration gradient

water moves by osmosis through a semi-permeable membrane of root hairs and between cells of stem

in stem water moves by cohesion(attraction of water molecules to each other)

it also moves by adhesion(attraction of water molecules to walls)

capillarity is due to narrowness of xylem vessels

transpiration pull occurs When Water vapour evaporates from sub-stomatal chambers into the air

root pressure is a force that pushes Water up the stem from the roots and causes guttation /exudation

ii) Explain the uptake of mineral salts by plants

plants require mineral salts for metabolism and proper functioning of their bodies

mineral salts are taken up from the soil into the root hairs in form of solution by active

transport which requires energy

active transport involves substances called carriers taken up together with water and are then carried to the stems and leaves

the main process involved in uptake and movement of mineral salts is active transport

b) i) What is transpiration?

loss of water from plant to the atmosphere

ii) Name the sites through which transpiration takes place in a plant

stomata (stomatal transpiration)

lenticels (lenticular transpiration)

cuticle(cuticular transpiration)

iii) State the importance of transpiration to plants

cooling the plant

transport of water

transport of mineral salts

excretion of excess Water from plants

excess transpiration causes wilting

i) Explain the structural factors that affect the rate of transpiration in plants

number of stomata i.e. the more the stomata the higher the rate and vice versa

turgidity of the guard cells which control the opening and closing of stomata when they are open transpiration rate is high

size of leaves where the larger the surface area the higher the rate of transpiration

leaf fall leads to lower rate of transpiration and also drying of leaves reduces rate of transpiration

Thin cuticle reduces distance through Which water vaporizes hence increase transpiration rate. Absence of cuticle also increase rate of transpiration

ii) Explain the environmental factors that affect rate of transpiration in plants

high temperature increases rate of transpiration and low temperature reduces the rate

humidity when high increases rate and when low reduces the rate

transpiration rate is higher in moving air (wind) than in still air

high light intensity increases internal temperature hence higher rate of evaporation leading to higher rate of transpiration

availability of water in the soil leads to more absorption hence more loss to the atmosphere

atmospheric pressure when high leads to more evaporation and when low leads to low rate evaporation of water

iii) State the structural differences between xylem vessels and sieve tubes

sieve tubes have cross wall while xylem vessels have none

xylem vessels are lignified while sieve tubes are not

Sieve tubes have cytoplasm elements while xylem vessels have none.

iv) State the adaptations of plants which enable them to reduce water loss

thick waxy cuticle

reduced leaf size/thorns/spines

shedding of leaves

Sunken stomata. Water vapour accumulates in the depression of stomata lowering the water vapour concentration gradient leading to lower rate of evaporation

rolling of leaves

v) State the factors that cause increase in the rate of transpiration from leaves

increased light intensity

low relative humidity

temperature

vi) Explain how drooping of leaves on a hot sunny day is advantageous to a plant

reduces surface area exposed to sun reducing cuticular transpiration

c) Explain how aquatic and terrestrial plants are adapted to deal with problems of transpiration

a. Mesophytes

they grow in soils with enough water

water loss is perfectly balanced by absorption of more from the soil

no special adaptations

b. Xerophytes

they grow in dry conditions

root grow very deep to absorb water

succulent/ﬂeshy leaves to store water

few stomata which are sunken

thickened waxy cuticle

leaves are hairy and often folding

some leaves are needle-like/spines or scales

leaf surfaces are reduced i.e. small leaves

all these adaptations are to reduce water loss

c. Hydrophytes

plants that grow in water

presence of sclereids

leaves are broad

leaves have many stomata on upper side only (none on the lower surface)

some leaves ﬂoat on water

absence or reduced leaf cuticle

large air spaces

some leaves are submerged

poorly developed or reduced vascular bundles

d) i) What is translocation

transfer of manufactured food substances to the parts where they are required

ii) Name the tissue which is responsible for translocation of manufactured food in ﬂowering plants

phloem tissue

iii) Name the processes that bring about the translocation of manufactured food

active transport

Diffusion

Mass ﬂow

Cytoplasmic streaming

iv) Draw a labeled diagram to represent phloem tissue

ii) State the functions of the labbeled structures cytoplasmic strands

translocation

Companion cell

supply nutrients to sieve tube element

supply energy for translocation

regulates activities of tube cells/elements

Sieve tubes element

conduct food down the stem

iii) name the compounds that are translocated in phloem

sugars

amino acids

hormones e.g auxins

oils/lipids

resins

vitamins

Describe an experiment you would carry out in order to demonstrate that phloem transports manufactured food substances in a plant

a. Ringing experiment

cut a ring in the bark including the phloem from the stem of a woody plant

phloem is found next to or just beneath the bark

observe daily for some time(more than three weeks)

a swelling of the bark appears above the ring

this is due to accumulation of food from leaves

the bark of a second similar plant is removed carefully leaving the phloem intact

a swelling does not appear

ii) Use the radio-active tracers

plant is exposed to carbon containing radio-active carbon C14

C14 is found in the end products of photosynthesis

It is finally detected in phloem

C14 is found to move in both directions

iii) Collecting exudate from stylets of aphids

aphids feed on certain plant phloem using their stylets

aphid mouth parts are dissected using a sharp razor

exudes from the mouth parts are collected and then analyzed

sucrose is found to be a major component of the exudates

this proves that phloem translocates manufactured food substances

e) Describe an experiment you would carry out to demonstrate that xylem transports water

i. Either

cut a stem of a young plant or twig of a tree under water

or else uproot a young herbaceous plant and wash the soil gently

put some water in a beaker and add a dye i.e. eosin or red ink and place the cut stem or young plant in a beaker

leave for time e. g. between 20 minutes and one hour

cut a thin section of stem or leaf

mount it on a slide and examine under a microscope

observe and note the distribution of the dye or ink

the dye appears only in the xylem vessels

ii. OR

use radio-active tracers, C14 in form of carbon

ring a plant then put it in a container containing radio-active phosphorous solution

The radio-active phosphorus is later detected in the leaves.

2. a) i)List the components of animal transport systems

system of blood vessels in which materials are circulated round the body

blood, a ﬂuid medium which contains dissolved substances and cells

the heart, a pumping mechanism which keeps blood in circulation

ii) Distinguish between closed and open circulatory systems

closed system has blood vessels through which blood moves eg vertebrates

open system has no blood vessels hence blood is in direct contact with tissues e. g arthropoda

iii) What are the advantages of the closed circulatory system over open circulatory system?

Closed system has continuous vessels hence able to generate high pressure

Circulates blood over longer distance

Circulates blood at a faster rate

Efficient transport of nutrients and waste products

Animals are more active

iv) Distinguish between single circulatory system and double circulatory system Single circulatory

blood passes through the heart once in a complete circuit of the body

Double circulation

blood enters the heart twice in a complete circulation

Pulmonary circulation from the heart to lungs and back

Systemic circulation from the heart to body systems and back

b) i) Describe the general layout of the transport system in mammals

blood which is a ﬂuid tissue of the body carrying food substances, oxygen, carbon IV oxide and metabolic wastes

arteries which are elastic tubes carrying blood from the heart to cells

veins which are blood vessels carrying blood away from the cells to the heart

capillaries which are extremely numerous and are microscopic channels connecting arteries to veins

ii) Describe the structure and function of the mammalian heart

the heart is a four-chambered hollow muscle located in the thoracic cavity

it consists of two small receiving chambers, the atria(auricles) and two larger pumping chambers, the auricles

the left ventricles is the most powerful and has the thickest walls

this is because it is the chamber which pumps blood throughout the body

each time it contracts, blood is forced out into the elastic arteries(aorta)

blood moves on to the capillaries

from capillaries blood moves to veins and back to the heart through the vena cava

from vena cava it enters into right auricle which contracts and pumps blood into the right ventricle

right ventricle pumps blood into the lungs through the pulmonary artery

blood releases carbon IV oxide to lungs and picks oxygen then returns to left auricle

left auricle pumps blood into left ventricle

left ventricle then pumps blood into the aorta and into arteries, starting the process all over again

both auricles contract simultaneously while both

iii) Explain how the mammalian heart is adapted to performing its functions

the heart is made of muscles that contract and relax synchronously without requiring nervous stimulation

nerve supply however, determine contraction strength and frequency

the heart is divided into four chambers

The right atrium is connected to the right auricle. It receives blood from the whole body.

The blood is pumped from the left atrium to the right ventricle

To avoid ﬂow back into the right atrium, a valve is present between the two chambers

the tricuspid valve

The right ventricle pumps blood to the lungs

This is facilitated by the presence of pulmonary artery

A valve is also present to avoid blood flowing back from the pulmonary artery to the right ventricle

Blood from the lungs enters the heart through the pulmonary vein into the left atrium.

When the left atrium contracts, blood ﬂows into the left ventricle

Blood will not flow back into the left atrium because of the presence of bicuspid valve(mitral)

The left ventricle is connected with the aorta and when it contracts, blood ﬂows into the aorta for distribution into the whole body

The heart muscle surrounding the left ventricle is thicker than that surrounding the right ventricle to be able to generate enough pressure to push blood to the whole body

A pace-maker is present in the heart muscle to initiate and synchronise contractions.

For the heart muscle to be well nourished and be provided with enough oxygen and carbon IV oxide removal, it is supplied with blood by the coronary arteries and drained by the coronary veins

iv) Explain why blood leaving the lungs may not be fully oxygenated

under ventilation of the lungs

blockage of alveoli (air sacs)

high cardiac frequency i.e. high rate of pumping of blood in the heart

e) Describe the structure and functions of the blood vessels

i. Arteries

carry away blood from the heart

carry oxygenated blood except pulmonary artery which takes blood from the heart to lungs for oxygen

have thick, muscular walls

are elastic

have narrow lumen

all these adaptations are required to withstand high pressure caused by heartbeat

ii. Capillaries

link arterioles and venules to arteries and veins

small in diameter to increase pressure resistance for materials to filter out

thin walled as they consist of a single layer of cells to allow diffusion of substances e.g leucocytes to tissues

thin walled to allow presence of intercellular spaces

large number i.e. numerous to provide a large surface area for exchange of materials

have sphincter muscles at the junction of the arterioles and capillaries to control movement of blood into them

lie close to the body for easy exchange of materials

iii. Veins

carry blood back to the heart

all carry deoxygenated blood except pulmonary vein that carries blood from the heart to lungs

have thinner Walls than arteries

have valves to prevent back flow of blood

have wide lumen

b) i) State the ways in which the composition of blood in the pulmonary arterioles differs from that in the pulmonary venules

pulmonary arterioles

deoxygenated

high carbon iv oxide

low oxygen

more nutrients

pulmonary venules

oxygenated

low carbon iv oxide

high oxygen

less nutrients

ii) Give the reasons why pressure of blood is greater in the arterioles than I the veins of mammals

blood is pumped to the arteries by the heart at high pressure

blood pressure in veins is reduced by capillary resistance

arteries have narrow lumen which maintains high pressure/veins have wide lumen which reduces pressure

arteries have more/thicker muscular walls which generate pressure/veins have less/thinner muscular walls which reduce pressure

iii) Name the common heart diseases in humans

thrombosis

antheroma

arteriosclerosis

varicose veins

cerebral vascular thrombosis

c) i) State the functions of mammalian blood

transport of substances

defense against diseases

clotting

temperature regulation

ii) Describe how mammalian blood components carry out their functions Plasma

transport dissolved food substances like glucose, amino acids, fatty acids and glycerol from small intestines to liver and other body tissues

transports hormones, enzymes from secretory glands to tissues when required

transports carbon IV oxide to lungs and urea from tissues to the kidneys

distributes heat

bathes the tissues allowing for exchange of materials

contains protein fibrinogen and pro-thrombin which take part in blood clotting

Red blood cells (Erythrocytes)

transports oxygen from the lungs to body tissues in form of haemoglobin

transport carbon IV oxide from body tissues to the lungs in form of bicarbonates

White blood cells (leucocytes)

engulf foreign bodies

produce antibodies for defense against disease

produce antitoxins which neutralize bacterial toxins

Blood platelets (thrombocytes)

produce an enzyme called thrombokinase/thromboplastin necessary for blood clotting

prevents loss of blood, water and mineral salts

iii) State the Ways in which the red blood cells are adapted to their functions

many per unit volume hence carry more oxygen and carbon IV oxide

biconcave in shape to provide large surface area for absorption of oxygen and carbon IV oxide

absence of nucleolus hence more haemoglobin to carry sufficient oxygen and carbon IV oxide

alter shape to be able to pass through the narrow lumen of capillaries to deliver or supply oxygen and carry away carbon IV oxide

have haemoglobin with high affinity for uptake of oxygen and carbon IV oxide

iv) State the structural differences between a red blood cell and a white blood cell.

Red blood cells

has hemoglobin

smaller size

lacks nucleus

White blood cells

not pigmented

larger size

nucleated

v) State the functional differences between a red blood cell and a White blood cell

Red blood cell

Transports oxygen and carbon IV oxide

White blood cell

Protects body against harmful pathogens

How does the heart increase blood flow to some parts of the body during exercise

stronger contractions

faster contractions/heartbeat

Explain how oxygen and carbon Iv oxide are transported in the blood

Oxygen

oxygen concentration is higher in lungs(alveoli) that in blood

oxygen in the alveoli dissolves in the film of moisture and diffuses through thin epithelial and capillary walls into plasma and red blood cells

the oxygen combines with haemoglobin to form oxyhaemoglobin

blood then becomes oxygenated

blood from lungs then travels to all body tissues where the oxyhaemoglobin breaks down to form oxygen and haemoglobin

haemoglobin is transported back to the lungs to collect more oxygen while the oxygen in capillaries diffuses into body cells for respiration

respiration produces carbon IV oxide

Carbon IV oxide

carbon IV oxide produced during respiration diffuses out of cells into blood plasma and red blood cells due to concentration gradient

carbon IV oxide and water fonn carbonic acid carbamino compounds with haemoglobin

in the presence of carboxyl anhydrase enzyme, hydrogen carbonate is carried in blood to the lungs

in the lungs the hydrogen carbonate dissociates to liberate carbon IV oxide which diffuses into alveolar cavity due to concentration gradient

from alveolar space carbon IV oxide is expelled during expiration

Most carbon IV oxide is transported from tissues to lungs within the red blood cells and not in the blood plasma. Give the advantages of this mode of transport.

PH of blood is not altered/homeostasis is maintained

Within the red blood cell is an enzyme, carbonic anhyrase which helps in fast loading(combining) and offloading of carbon (iv) oxide

d) i) what is blood clotting?

process in which blood components clump together to prevent loss of blood from an injured/cut vessel

ii) Name a protein, vitamin, an enzyme and a mineral element involved in blood clotting

Protein — fibrinogen/prothrombin

Vitamin - k/quinine

Enzyme — thrombokinase/thromboplatin/thrombin

Mineral element — calcium

iii) describe the blood clotting process

enzyme thromboplastin produced in the platelets of damaged tissues converts plasma

protein prothrombin into thrombin in the presence of calcium ions

thrombin converts another plasma protein fibrogen into fibrin in the presence of vitamin K

fibrin is insoluble

fibrin forms fibres which form a meshwork that forms a clot

prothrombin thromboplastin thrombin

calcium ion

Fibrinogen thrombin fibrin clot

vitamin K

iv) State the role of blood clotting on wounds

prevents blood/body ﬂuids from being lost

conserves water and salts

prevents entry of microorganisms/pathogens

regulates body temperature

enables wound to heal faster

v) Explain why blood ﬂowing in blood vessels does not normally clot

Presence of anticoagulant in blood

e) i. list the major types of human blood groups

O, with neither B nor A antigen

AB, with both A and B antigens

A, with type A antigen

B, with type B antigen

iii. Explain the meaning of :

Universal donor

a person who can donate blood to any other blood group without agglutination/clumping

this is usually blood group O

however this person cannot receive blood from other blood groups except group O

Universal recipient

can receive blood from all blood groups without agglutination

this is usually blood group AB

however, can only donate blood to group AB

iii) What is the difference between rhesus positive and Rhesus negative blood samples?

rhesus positive blood has the Rhesus (Rh) antigen

rhesus negative lacks the Rhesus antigen

vi) What is blood transfusion?

Introduction of blood from one person to another

v) Under what conditions would blood transfusion be necessary in people?

during accidents

during surgery in hospitals

bleeding mothers when giving birth

vi) How can low blood volume be brought back to normal?

transfusion

taking ﬂuids

eating iron rich food/taking iron tablets

How may excessive bleeding result in death?

Anaemia/low blood volume/loss of iron/low red blood cells count/low haemoglobin leading to low oxygen, loss of nutrients and dehydration.

State the precautions that must be taken before blood transfusion

blood must be disease free

sterilized equipment must be used

blood of the recipient and that of the donor must b compatible to both ABO and rhesus factor

Fresh blood must be used.

j) i) What is immunity?

Resistance to disease by organisms

ii) Distinguish between natural and acquired immunity

natural immunity is inherited/transmitted from parent to offspring/inborn/innate

Acquired immunity is developed after suffering from a disease or through vaccination.

iii) What are allergic reactions?

Excessive sensitivity and reaction of an individual to certain substances in environment e.g. dust, pollen, perfumes, smoke etc.

vi) How does an allergic reaction occur?

the substances act as antigens

an antigen-antibody reaction occurs on surface of cells

the cells release a substance called histamine

the histamine causes irritation, itching and may stimulate nasal discharge

ii) State the role of vaccination against certain diseases

protect body against infectious diseases

prevent spread/transmission of certain diseases

diseases for which vaccination is given include tuberculosis, poliomylitis,measles,

whooping cough, diphtheria

3. a) i) What is gaseous exchange?

The continuous exchange of oxygen and carbon Iv oxide between the organism and environment

ii) Why is gaseous exchange important to organisms?

to supply oxygen necessary for energy production

to remove carbon IV oxide produced during respiration

To remove Water vapour.

b) i) name the structure used for gaseous exchange by plants

stomatal pores/stomata

lenticels

cuticle

pneumatophores

ii) Brieﬂy describe the structure of stomata

are minute pores found in leaf epidermis

each consists of a slit-like opening

Each is bordered by two large, bean-shaped guard cells.

Guard cells contain chloroplasts, unlike the other epidermal cells which enable photosynthesis to occur

Inner walls of guard cells are thicker than the outer cells

iii) State the factors which affect stomatal opening

water which when low stomata close and when high stomata keeps open

light as stomata open in bright light and close in darkness

temperature

iv) Name the theories suggesting the mechanism of opening and closing of stomata

interconversion of starch and sugar

pH theory

mineral ion concentration

v) Describe the mechanism of opening and closing of stomata

stomata close at night and open during daytime

This comes about due to changes in turgidity as a result of pH changes in guard cells.

In the dark carbon dioxide accumulates in the intercellular spaces

This raises concentration of carbonic acid

The pH drops (pH lowered)

Enzymes convert sugar into starch in guard cells

Osmotic pressure in guard cells is lowered

Water moves out of guard cells by osmosis making cells lose turgidity hence become ﬂaccid

The stomata close

During day time there is photosynthesis hence the production of sugar, carbon IV oxide concentration is lowered, pH increases, guard cells become turgid causing stomata to open.

During the day potassium ions concentrate in guard cells, raising their osmotic pressure and causes then to open

In the night the concentration of potassium ions decreases increasing osmotic pressure in guard cells therefore causes stomata to open.

i) What is the advantage of having stomata open during daytime and having them closed at night?

opening in the daytime allows diffusion of carbon IV into the leaf for photosynthesis to take place and allows diffusion of oxygen out of the leaf

transpiration also takes place, thus cooling the leaf and facilitating uptake of water and mineral slats

Closing in the night is to conserve water in the plant especially when there is not enough water available in the soil.

c) i) State the ways in which leaves of plants are adapted to gaseous exchange

presence of stomata for faster gaseous exchange

intercellular spaces/air spaces in the leaf for movement/circulation of air

film of moisture around the surface of cells for easy diffusion

broad/ﬂattened shape to increase surface area

thin lamina to reduce distance of diffusion

exposed to air for easy diffusion

ii) Describe how gaseous exchange takes place in terrestrial plants

Gaseous exchange takes place in spongy mesophyll

During the day air diffuses into large air spaces of spongy mesophyll through stomata

The carbon iv oxide in the air diffuses into the photosynthesis oxygen is produced

Some of the oxygen diffuses out of the leaf through stomata

During the night air diffuses out of air spaces of spongy mesophyll

The air dissolves into film of moisture

The oxygen in the air diffuses into cells and is used in respiration during which carbon iv oxide is produced

The carbon iv oxide diffuses out of the leaf through stomata due to diffusion/concentration gradient

At night carbon iv oxide accumulates in the leaf since photosynthesis does not take place

Some gaseous exchange also takes place through cuticle

Gaseous exchange occurs through epidermis of young leaves and stems

The cork cells at lenticels are loosely packed

Gaseous exchange takes place between cork and atmosphere within the loosely packed cell

iii) State the ways in which ﬂoating leaves of aquatic plants are adapted to gaseous exchange

stomata found only on upper dermis to allow efficient gaseous exchange

presence to aerenchyma tissues/large air spaces to enable it ﬂoat/buoyancy/storage of air

absence of cuticle to enhance gaseous exchange

iv) How is aerenchyma tissue adapted to its function?

has large airspaces which store gases/for gaseous exchange/buoyancy

v) Explain stomatal distribution in plants of different habitats

land plants have their stomata mainly on the lower side to reduce water loss but if on both sides then upper side has very few

water plants, ﬂoaters, have stomata on upper side to enhance water loss

in dry areas, plants have leaves with sunken stomata to reduce water loss by transpiration

Plants in wet areas have stomata equally distributed on both sides.

d) i) List the types of respiratory surfaces of animals

cell membrane in unicellular organisms e. g. amoeba

gills in fish

tracheal system

skin, buccal cavity and lungs in amphibians

lings in mammals

ii) State the characteristics of respiratory surfaces in animals

moist thin walled/thin membrane/thin surface

Highly/richly vascularised/numerous blood vessels/Well supplied with blood vessels.

Large surface area

iii) Describe gaseous exchange in protozoa

example is amoeba

small and have large surface area

oxygen diffuses into the organism and carbon IV oxide diffuses out into Water

simple diffusion of gases is enough to meet its respiratory requirements

e) i) Make a labeled drawing of a fish gill

ii) How is a fish gill adapted to its function?

large surface area due to many filaments

extensive vascularisation due to capillaries, for gaseous exchange

thin filaments to facilitate diffusion of gases

presence of rakers to filter solid particles

gill bar is bony, hard and firm to support the filaments and rakers and for attachment of filaments and rakers

iii) Discuss gaseous exchange in bony ﬁsh

example is tilapia

the mouth opens and the ﬂoor of the mouth is lowered so that the volume in the mouth is increased and pressure is lowered

water then enters into the mouth cavity

the mouth is closed and the floor of the mouth raised so that the volume is reduced this raises the pressure, forcing water over gills and out through the operculum

As water passes over the gills oxygen diffuses due to concentration gradient (partial pressure) into the blood stream.

In the body tissues, carbon IV oxide diffuses into the blood (due to concentration gradient, and is transported to the gills and diffuses out into the water.

iv) What is counter-flow system?

Where water in which the fish lives flows in opposite direction across the gill.

vi) What is the advantage of counter-flow system?

maintains a diffusion gradient so that there is maximum uptake of oxygen

oxygen continues diffusing into blood and carbon iv oxide into Water

f) i) Describe the mechanism of gaseous exchange in terrestrial insects

example is cockroach

air in the atmosphere contains oxygen

air is drawn into the body of the insect through the spiracles due to movement of abdominal muscles

these movements cause the opening of spiracles

air moves through the trachea to tracheoles

oxygen moves from the tracheoles into body cells by diffusion due to concentration gradient

carbon iv oxide in the tissues diffuses into tracheoles due to concentration gradient

From tracheoles carbon IV oxide moves into trachea and out through the spiracles into the air.

ii) State how traceholes are adapted to gaseous exchange

thin walls of tracheoles

moist surface

large surface area due to numerous tracheoles

g) i) What is breathing?

Any process which speeds up the rate of gaseous exchange between an animal and its surrounding.

ii) Name the structures in humans that are used in gaseous exchange

nose

larynx

epiglottis

trachea

lungs

pleural membrane

pleural cavity

diaphragm muscles

iii) Describe the mechanism of gaseous exchange in a mammal

Breathing in

external intercostals muscles contract while internal intercostals muscles relax, raising then ribcage upwards and outwards

muscles of the diaphragm contract hence it ﬂattens

the volume of the thoracic cavity increases while pressure decreases

higher air pressure in the atmosphere forces air into lungs through the nose

Breathing out

external intercostals muscles relax while internal intercostals muscles contract, moving the ribcage downwards and inwards

muscles of the diaphragm relax hence the diaphragm assumes dome shape

the volume of the thoracic cavity decreases while pressure increases

the higher pressure forces air out of the lungs through the nose

iv) Explain how mammalian lungs are adapted to gaseous exchange

large number of alveoli that increase surface area

moist inner surface of alveoli for dissolving oxygen/gases to facilitate exchange of gases

through alveolar cavities and blood

thin walls of alveoli to allow efficient/faster diffusion of gases

rich capillary/blood supply on alveolar surface to transport oxygen away from the lungs and carbon IV oxide to the lungs

v) Name the features of alveoli that adapt them to their function

have large surface area/spherical shaped

numerous/many to increase surface area

one cell thick

moist surface for air to diffuse

highly vascularised/numerous capillaries

vii) How is the trachea of a mammal suited to its function?

has a ring of cartilage which keeps it open at all times

cilia that move mucus/particles to the top of the trachea i.e. into larynx for removal

mucus to trap dust, solid particles and microorganisms

hollow for passage of air

viii) State the advantages of breathing through the nose rather than through the mouth

nose has hairs to filter solid particles

it has mucus lining to trap dust particles

the nose has cells sensitive to smell for survival

it warms the air before it reaches the lungs

ix) Give the conditions under which the carbon iv oxide level rises above normal in mammalian blood

vigorous exercise

emotions/stress

disease infection

x) Explain the physiological changes that occur in the body to lower the carbon iv oxide level back to normal when it rises

heartbeat/cardiac frequency increases to pump blood faster carbon iv oxide from the tissues and supply more oxygen

ventilation rate/rate and depth of breathing increases to take more oxygen and remove carbon iv oxide from the lungs

arterioles to take in more oxygen and remove carbon iv oxide from the lungs

arterioles dilate leading to faster ﬂow of blood to and from body tissues

h) i)Describe the factors which control the rate of breathing in humans

breathing movements usually occur unconsciously

it is controlled by the medulla oblongata part of the brain situated at the breathing centre

medullar oblongata is in the brain

respiratory centre transmits impulses to the diaphragm through phrenic nerves

carbon iv oxide concentration in the blood determines the breathing rate

if carbon iv oxide is less, the brain is triggered to decrease breathing rate

cardiac frequency decreases and the arterioles constrict

therefore carbon iv oxide level is raised

this brings back to normal level of breathing and carbon iv oxide level increases/is more

the brain is triggered to increase breathing rate

cardiac frequency is increased

there is vasodilation of arterioles

carbon iv oxide level falls

therefore the normal level is attained and carbon iv oxide is removed faster

ii) Name the respirator diseases

asthma

bronchitis

whooping cough

pneumonia

tuberculosis

4. a) i) Deﬁne respiration

the oxidation/breakdown of food within cells to release energy

ii) Explain the signiﬁcance of respiration in living organisms

it yields energy (ATP)

this energy enables organisms to move, grow, excrete and reproduce

iii) Where does respiration take place?

in the mitochondria

b) i) Draw and label a mitochondrion

ii) State the most important function of mitochondria

to produce Adenosine triphosphate (ATP) which is the energy source of the Whole cell

iii) Give the functions of the labeled parts

Outer membrane

controls what enters and What leaves mitochondrion

Cristae

also called inner membrane

increase surface are for attachment of enzymes

this is Where cellular oxidation reactions occur

Matrix

enzymes are located here

other reactions occur here

c) Explain the roles of enzymes in respiration

they catalyse reactions i.e. speed up respiration

d) i) What is aerobic respiration

respiration in the presence of oxygen

ii) Give a word equation for aerobic respiration

glucose + oxygen - Water + carbon iv oxide + energy

iii) What are the end products of aerobic respiration?

energy

carbon iv oxide

water

e) i) What is anaerobic respiration

occurs in the absence of oxygen e. g. yeast and certain bacteria release energy in the absence of oxygen

ii) What are obligate anaerobes?

are completely independent of oxygen

iii) What are facultative anaerobes?

can survive both in the presence and absence of oxygen also called partial anaerobes

iv) State the Word equation representing anaerobic respiration in plants

Glucose ethanol + carbon (iv) oxide + energy

v) Name the end products of anaerobic respiration in plants

alcohol/ethanol

carbon iv oxide

energy

g) i) Give a word equation of anaerobic respiration in animals

Glucose —> lactic acid + energy

ii) Name the end products of respiration in animals when there is insufﬁcient oxygen supply

lactic acid

energy

iii) Why is there a high rate of lactic acid production during exercise?

the demand for oxygen is more than supply leading to anaerobic respiration

iv) Why does lactic acid level reduce after exercise?

lactic acid is oxidized to form carbon iv oxide and water

some is converted to glucose

some is converted into glycogen

v) State why accumulation of lactic acid during vigorous exercise lead to an increase in heartbeat

lactic acid is poisonous to tissues and must be removed

to increase supply of oxygen to tissues

State the economic importance of anaerobic respiration

brewing of alcohol

biogas production

compost manure formation

silage formation

baking bread

production of dairy products

fermentation of milk

sewage treatment

Fermentation of tea in industries.

What is oxygen debt?

amount of oxygen required to convert accumulated lactic acid to water, carbon IV oxide and energy

h) i) What is respiratory quotient(RQ)?

ration of carbon IV oxide produced to oxygen consumed

RQ = volume of CO2 produced

volume of oxygen consumed

ii) Why are respiratory quotient important

their calculation assists in identifying the kind of substrate being used in respiration

iii) Name the respiratory substrates

carbohydrates

fats

proteins

iv) Why does anaerobic respiration of a given substrate yield a smaller amount of energy than aerobic respiration?

Some energy locked up in intermediate products like ethanol in plants and lactic acid in animals

substrate is completely oxidized in aerobic respiration

iv) Explain the disadvantages of anaerobic respiration

Less energy produced in anaerobic respiration since food is partially oxidized while in

aerobic respiration food is completely oxidized.

Some metabolic wastes accumulate in cells affecting cellular functions

Ethanol produced in plants poisons the tissues while lactic acid produced in animals

causes muscle fatigue/muscle cramp and may stop muscle contraction

Such intermediate wastes are not produced in aerobic respiration

v) Mention the types of experiments carried out for respiration

germinating seeds which yield energy in form of heat

animals produced heat when they respire

yeast cells respire to produce heat

5. a) i) Define the following terms

Excretion

the process by which organisms get rid of waste products which result from chemical process which occur in living cells

Secretion

the process by which organisms produce substances which are useful to the body, by glands

Egestion

removal of indigestive materials from the body

Homeostasis

maintenance of constant internal environment

ii) Explain Why excretion is necessary in plants and animals

-products of excretion are usually harmful while some are toxic

- if allowed to accumulate in the cells they would destroy tissues and interfere with normal metabolism

- They are therefore removed through excretion

b) i) Describe how excretion takes place in green plants

carbon IV oxide, oxygen and water diffuse through the stomata, lenticels and hydathodes

some toxic wastes are convened into non-toxic substances

these are deposited in certain tissues of the plant or stored in aging stmctures

resins and tannins are exuded through the bark of stem or lost during leaf fall

ii) Why do plants lack complex excretory structures like those of animals?

plants have lower rates of metabolism

plants excrete non-poisonous products derived from carbohydrate metabolism unlike animals which produce toxic wastes derived from protein metabolism

plants re-use some of their wastes like nitrogenous wastes used in protein synthesis

plants store waste products in roots, fruits and leaves

ii) State the excretory products of plants and some of their uses to humans

caffeine from tea and coffee is used in medicine and as a stimulant which is harmful to humans

quinine used for treating malaria

cocaine derived from leaves of cocoa plant used as a stimulant by addicts or as a local anesthesia, also causes damage to the brain, may cause addiction if not well used and is an illegal drug

Tannins derived from barks of acacia (wattle bark) trees are used to make ink and tanning (softening) of leather.

Nicotine got from leaves of tobacco plant stimulates the central nervous, may cause addiction if much is used or consumed. It is used to make cigarettes, cigars and is poisonous. It is a precursor of lung cancer

Cannabis sative(bhang) is used to make drugs

Gum derived from glues is used for sticking substances and making certain jellies

Rubber, a product of latex, got from rubber plant is sued to make tyres and synthetic fibres

Morphine from opium poppy plant is a narcotic and illegal drug as it causes addiction

Khat and miraa are used as stimulants

Colchicines used in inducing polyploidy, cancer therapy, treatment of gouts in small quantities

Papain used as meat tenderizer

c) i) Describe excretion in unicellular organisms

-examples are amoeba and paramecium

-They have to remove waste products such as carbon IV oxide and nitrogenous substances e. g urea and ammonia

- These diffuse from the body surface into the surrounding Water

- Diffusion is due to large surface area

ii) List excretory organs and products of mammals

kidney excretes urea, water and salts

skin excretes Water, slats and urea

lungs excrete carbon IV oxide and water

liver excretes bile salts

d)i) Draw and label a mammalian skin

ii) Explain how the mammalian skin is adapted to its functions

the skin is made up of dermis and epidermis

Epidermis

it is made up of three layers

the outermost layer, comiﬁed layer is made up of dead cells that prevent entry of microorganisms, prevent physical damage and dessication

granular layer made of living cells gives rise to corniﬁed layer

malpighian layer is made up of actively dividing cells that give rise to new epidermal cells/granular layer it contains melanin that protects the body against ultra violet rays(radiations)

Dermis

has several components

Has sweat gland which produce sweat through sweat pores on the skin and the sweat evaporates cooling the body by lowering body temperature. When it is cold, no sweat is produced, conserving water

sweat contains water, sodium chloride, uric acid and urea hence the skin acts as an excretory organ

Has hair. The hair stands erect to trap air when temperature is low to reduce loss/insulation. It lies ﬂat to allow heat loss when temperature is high.

Has nerve endings which are sensitive to stimuli such as heat, cold, pain, pressure and touch

Has subcutaneous fat/adipose fat that insulates the body against heat loss

Has arteries and capillaries (blood vessels) that supply food and oxygen and remove excretory products. Arterioles vasodilate when temperatures are high to lose heat by radiation, and convention. Arterioles constrict when temperatures are low to conserve heat i.e. reduce heat loss

Has sebaceous glands which secrete sebum, and antiseptic and water repellant that prevents drying and cracking the skin by making the skin supple

e) What is the role of lungs in excretion?

during respiration oxygen is used up in the body cells to produce energy

carbon IV oxide is produced as a by-product

the carbon IV oxide must be eliminated from the body

elimination is through the lungs

also, water vapour is formed and must be removed

this removal is through the lungs

the lung is therefore considered as an excretory organ as it removes carbon IV oxide and water vapour which are by-products of respiration

f) State the functions of the liver

i. Excretion

in this function the liver is aided by the kidney

deamination i.e. excess amino acids converted into urea and uric acid which is transported to skin and kidney for removal

detoxiﬁcation where harmful substances are converted into harmless ones in the liver and transported to kidneys for removal

breakdown of worn out blood cells and haemoglobin and the residue excreted through the

kidney to give urine a yellow tinge

Breakdown of sex hormones after they have performed their function and the wasted are

released through the kidney and bile.

ii) Homeostasis

regulation of blood glucose

the normal amount of glucose in blood is about 90mg/ 100

increase in blood sugar is detected by cells of the pancreas which secrete insulin

insulin stimulates the liver to convert excess glucose to glycogen

further excess glucose is converted to fats until the normal blood sugar level is attained

Excess glucose is oxidized to carbon IV oxide, water and energy. Excess glucose is also used in respiration

decrease in blood sugar level below normal level is detected by the pancreas, which secretes glucagon which stimulates the liver to convert glycogen to glucose until the normal sugar level is attained

fats, amino acids are converted to glucose

it also leads to reduced oxidation of glucose

Deamination

excess amino acids are deaminated by the removal of amino group

the amino group is converted to ammonia

ammonia combines with carbon IV oxide to form urea

urea is excreted in urine through the kidney

Detoxification

poisonous substances are converted to less harmful compounds

Thermal regulation

maintenance of body temperature

heat is generated in the liver by chemical activities

the heat is distributed

g) i) Draw a labeled diagram of mammalian nephrone

ii) Describe how the human kidney functions

the afferent arterioles, which is a branch of the renal artery, supplies blood to the glomerulus

the afferent arteriole has a wider diameter than the efferent arteriole

this difference in diameter of afferent and efferent vessels causes high pressure leading to ultra filtration

the walls of the blood capillaries are one cell thick hence glucose, amino acids, vitamins,

hormones, salts, cratinine, urea and water filter into Bowman’s capsule to form glomerular filtrate

white blood cells, red blood cells, plasma proteins (such as globulin) and platelets are too large to pass through the capillary walls hence remain in blood capillary

the filtrate flows into proximal convoluted tubule where amino acids, vitamins and all glucose are selectively reabsorbed back into the blood stream

many mitochondria provide energy for reabsorption of these substances against a concentration gradient by active transport

the glomerular filtrate ﬂows into the loop of Henle

water in the descending loop moves by osmosis into the blood capillaries

sodium chloride is actively pumped from the ascending arm of the loop of Henle into the blood capillaries

the glomerular filatrate ﬂows into the distal convoluted tubule

water and salts are reabsorbed from distal convoluted tubule into blood capillaries

the glomerular filtrate ﬂows into collecting tubule (duct) from where more Water is reabsorbed into blood stream

antiduretic hormone inﬂuences the amount of Water reabsorbed depending on osmotic pressure of blood

the glomerular filtrate from collecting duct, now referred to as urine, is emptied into pelvis and ureter into bladder and out of body through urethra

urine consists of excess water, slats and nitrogenous wastes

iii) State the adaptations of proximal convoluted tubule to its function

folded to increase surface area for absorption thin epithelium to reduce distance of diffusion micro-villi on inner

lining to increase surface area for absorption folded to reduce speed of ﬂow for efficient absorption numerous mitochondira to provide energy for reabsorption dense capillary network to transport reabsorbed products

iv) Name the common kidney diseases

nephritis

kidney stones(renal calculi

cystitis

oedema

kidney failure

6. a) i) Why is homeostatic control necessary?

this provides a constant internal environment so that the cells of the body have the optimum (best) condition for their survival

ii) What is internal environment?

immediate surrounding of body cells

refers to tissue ﬂuid within an organism

b) i) Why is constant body temperature maintained by mammals?

most enzymes in the body function within a narrow range of temperature

high temperature denatures enzymes

low temperature inactivates and inhibits enzymes

ii) Explain the advantage gained by possessing a constant body temperature

animals remain active despite ﬂuctuations in environmental temperature

higher chances of survival in various environments ie they colonize various environments

chemical processes in their body continues at an optimum rate

iii) How do mammals regulate body temperature?

the body temperature of a mammal is kept constant

to maintain this temperature the mammal must be able to balance its heat loss against the heat gain

body temperature is controlled by the hypothalamus, a specialized part of the brain

changes in the temperature within the body and the surrounding are detected by the hypothalamus it transmits impulses to the skin and the blood stream in response to temperature changes hypothalamus acts as a thermostat for the body

a mammal loses heat by breathing out, urine, feaces, skin by radiation and by evaporation of sweat.

A mammal generates heat by the activity of its muscles, by general metabolism in respiration, or chemical activities

In hot conditions the hypothalamus stimulates responses that increase heat loss from the body hence lowering the body temperature

Such responses include sweating, vasodilation, keeping its hair ﬂat on the surface of skin and reduction of metabolic rate

In cold conditions the hypothalamus stimulates responses that generate heat gain in the body and reduce heat loss to the environment

Such responses include shivering, vasoconstriction, raising its hair to trap a layer of air around the skin because still air is a good insulator of heat and by generation of heat by increasing metabolic rate.

iv) Why does body temperature of a healthy person rise up to 37 C on a hot humid day?

sweat evaporation is reduced hence cooling is less therefore more heat is retained in the body causing temperature to rise

v) Name the structures in the human body that detect external temperature changes

temperature receptors (end bulb corpuscles e. g. bulb of Krause (warmth) and organ of Ruffinni (cold)

heat (thermal) receptors

vi) State the advantages that organisms with small surface area to volume ratio experience over those with larger

heat loss slow hence their body temperature can increase to intolerable levels

Heat gain from surrounding slower hence may remain inactive for a long time.

Need specialized and complex transport system and also gaseous exchange system

Explain why individuals with smaller sizes require more energy per unit body weight than those with larger sizes.

surface area to volume ratio is higher in smaller individuals than larger ones, therefore smaller heat is lost faster by smaller ones than larger ones

they therefore require more energy per unit body weight to maintain body temperature

c) i) What is the meaning of osmoregulation?

mechanism which regulates osmotic pressure of internal environment of an organism

the regulation/maintenance of salt/solute-water balance of an internal environment

ii) State the importance of osmoregulation

Maintenance of constant level of water and slats (osmotic pressure) for optimum/suitable conditions for metabolism suitable for cellular functions

iii) State the ways by which desert mammals conserve water fewer glomeruli longer loop of Henle

excretion of dry feaces or concentrated urine

hump for fat to be metabolized to give metabolic water for use

nocturnal, burrowing, aestivate or hibernate

sweat glands few or absent

more ADH (vasopressin)

iv) Explain why some desert animals excrete uric acid rather than Water

uric acid is less toxic than ammonia, hence elimination of uric acid requires less water

than ammonia therefore more water conserved

uric acid being less toxic is safer to excrete where there is less water/desert

v) Explain why eating a meal with too much salt leads to production of a small volume of concentrated urine

the concentration of salts in the blood rises leading to production of more ADH hence higher rate of water reabsorption by kidney tubules

vi) Explain how marine ﬁsh regulate their osmotic pressure

swallow plenty of sea water to increase amount of water in the body

have chloride excretory cells in their gills to remove excess salts

eliminate nitrogenous wastes in form of trimethalamine oxide which requires little water for elimination

few/small glomeruli thus slow filtration rate in the kidneys

retain nitrogenous wastes in form of urea to raise osmotic pressure of body ﬂuids

d) i) What is the biological signiﬁcance of maintaining a relatively constant sugar level in a human body?

body cells are surrounded by tissue ﬂuids that are isotonic/same osmotic pressure as cytoplasm

if sugar level is high/hypertonic, cell will lose water by osmosis to the surrounding, thus increasing the concentration of the contents

this changes the physiology of the cell

if the blood sugar is lower than the normal, the cytoplasm gains water by osmosis,

diluting the cell contents, thus altering the physiology of the cell

ii) Discuss the role of the following hormones in blood sugar control

Insulin

insulin is produced when there is increase in blood sugar concentration

it converts glucose to glycogen which is in the liver or muscle thus lowering sugar level

Glucagon

when glucose level decreases glucagon is produced, which causes the breakdown of glycogen to glucose thus raising blood sugar level

e) Explain the part played by antidiuretic hormone in homeostasis

Produced when there is less water (high osmotic pressure above normal level of salt concentration) in the blood.

It acts on kidney tubules (nephron) thus increasing water reabsorption from tubules to the blood stream, thus restoring osmotic pressure

When there is more water(lower osmotic pressure) or decreased salt concentration in blood, little or no ADH is produced, less water reabsorbed hence water loss in urine (more dilute urine) hence raising the osmotic pressure in body ﬂuids/blood

f) What is the role of blood clotting in homeostasis?

when a blood vessel is cut, there is exposure of blood platelets to the air

this triggers fibrinogen to be converted to fibrin

the fibrin forms a clot that prevents body ﬂuids e. g. blood from being lost

therefore the clot conserves water and salts in the body

g) Describe the role of the following hormones in homeostasis

i. Aldosterone

concerned with regulation of ionic balance

secreted by the cortex of adrenal glands

it increases sodium ion uptake by the gut and promotes the reabsorption of sodium ions (and therefore water) in the kidneys)

this is accompanied by elimination of potassium ions

this raises the overall level of sodium and lowers the overall level of potassium in the blood

as sodium ions are absorbed in the blood, chlorine ions follow so as to neutralize the effect of sodium ions

the production of aldosterone is regulated by the concentration of sodium ions which has an inhibiting effect, and a fall in sodium ions has a stimulating effect on the adrenal cortex

the ﬂow of aldosterone is stimulated by the adreno-cortic-tropic hormone (ACTH) produced in the anterior of the pituitary gland however, the main method of control is dependent on the fact that adrenal cortex itself is somehow sensitive to the relative concentration of potassium and sodium in the blood

ii. Adrenaline

produced by adrenal glands

in high concentrations, it increases hydrolysis of glycogen and increases blood sugar

it is usually released in emergency cases to increase glucose level for respiration

this releases energy for the emergency

h) i) Distinguish between diabetes mellitus and diabetes insipidus

diabetes mellitus is a condition resulting from insufficient production of insulin causing hyperglucaemia and presence of glucose in urine

diabetes insipidus is a condition whereby less or no antidiuretic hormone is secreted hence a high volume of water is passed out in urine in a condition called diuresis

ii) How can high blood sugar level in a person be controlled?

administer insulin

iii) Why does glucose not normally appear in urine even though it is filtered in the mammalian Bowman’s capsule?

glucose molecules are actively reabsorbed in the proximal convoluted tubules

iv) When is glycogen which is stored in the liver converted into glucose and released into the blood?

after activity/when blood sugar (glucose) falls below normal

when glucagon

stimulates the liver/when glucagon is produced

after strenuous/vigorous activity

during starvation

v) How would one ﬁnd out from a sample of urine whether a person is suffering from diabetes mellitus?

test or react urine in Benedict’s solution

positive result i.e. orange or red precipitate

Positive result is an indication of diabetes mellitus

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