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Biology Notes Form 1 - Biology Form 1 Notes - Form 1 Biology Notes
Introduction to Biology
Biology is a branch of science that deals with the study of living things. There are diverse forms of life on earth ranging from the invisible microscopic living things to the gigantic life forms. It aims at explaining the living world in terms of scientific principles.
It is important to note, however, that living things interact with the non living things in the environment as Well. Biology, therefore also entails the study of non living things as well.
The role of human beings in shaping the environment is also investigated in biology.
In summary, biology deals with the study of origins, types, nature, growth, development, interactions and maintenance of all life forms on earth.
Branches of Biology
Biology is such a broad field of knowledge. It is divided into two broad branches
1. Zoology- This is a branch of biology that deals with the study of animal life.
2. Botany- This is a branch of biology that deals with the study of plant life.
Within the two branches, there exist even smaller branches because the branches (botany and Zoology) are very wide and complex.
The smaller branches of biology include:
a) Ecology- This is the study of the interrelationships between organisms and their environment. Ecology aims at establishing how organisms are related to each other and their environment.
Ecology is further subdivided into smaller branches. These can be forest ecology, marine ecology, rangeland ecology etc.
b) Genetics- This sub-branch of biology deals with the study of inheritance and variation. It deals with the study of how variations (differences) occur between parents and their offspring. It is also concerned with how various characteristics are passed on from parents to offspring.
c) Entomology- This is the study of insects.
d) Parasitology- This is the study of parasites.
e) Physiology- This deals with the study of the functions of various structures of an organism. It deals with the processes that take place in the body of organisms.
f) Anatomy- The study of the internal structure of organisms
g) Microbiology- This is the study of microorganisms
h) Bacteriology- The study of bacteria
i) Ornithology- This is the study of birds
j) Itchthology-This is the study of fishes
This list is in-exhaustive as there are very many other branches of biology.
Importance of biology
> Joint development of HIV/AIDS vaccine by Kenyan and British scientists.
> The coordinated fight against Severe Acute Respiratory Syndrome involving scientist all over the world.
> The fight to save the ozone layer from depletion through various international agreements such as the Kyoto protocol.
> Management of resources through international treaties such as the CITES (Convention against International Trade on Endangered Species).
Characteristics Of Living Things
Living things share a lot of characteristics in common. These characteristics are discussed below.
a) Nutrition
Nutrition is the process by which living things obtain and assimilate (utilize) nutrients. Living things require nutrients for various purposes; growth, repair of worn out tissues and for provision of energy. Plants manufacture their own food using light energy, carbon (IV) oxide, water and mineral salts through the process of photosynthesis. Conversely, animals feed on already manufactured foods from plants and other animals.
b) Respiration
Respiration is the process by which food substances are chemically broken down to release energy. During respiration, oxygen is used while energy, carbon (IV) oxide and water are released. Respiration occurs in all living cells.
The energy produced in living things is very useful as it enables the living things carry out some of their physiological processes.
The energy is also required for growth and development, movement and repair of worn out tissues.
c) Gaseous Exchange
Gaseous exchange refers to the process by which living things exchange oxygen and carbon (IV) oxide across the respiratory surfaces. Animals always take in air rich in oxygen and give out air rich in carbon (IV) oxide.
Carbon (IV) oxide is a waste product of chemical reactions in the body. Animals require oxygen for respiration. Gaseous exchange, therefore, enables animals obtain oxygen for respiration and get rid of carbon (IV) oxide, a waste product.
Plants, however, require carbon (IV) oxide for photosynthesis during the day. They give away oxygen as a by-product. The plants equally require oxygen for respiration and give away carbon (IV) oxide.
d) Excretion
This is the process by which living things separate and eliminate the waste or harmful materials resulting from chemical reactions Within the cells. These harmful waste products of metabolism maybe toxic to the body if they are left to accumulate in the cells of the living things
e) Growth and Development
Growth refers to an irreversible increase in size and mass while development refers to the irreversible change in complexity of the structure of living things. Growth and development of living things is essential as it enables the living things to attain maximum size that can enable them to perform their functions and roles.
f) Reproduction
This is the process by which living things give rise to new individuals of the same kind. All living things reproduce. Reproduction is essential as it leads to perpetuation of species and it avoids extinction of certain animals and plants.
g) Irritability
This is the ability of living things to perceive (detect) changes in their environment and respond to them appropriately. Living things respond to changes in temperature, humidity, light, presence or absence of certain chemicals.
Response of organisms to these changes is crucial as it enables them to escape from harmful stimuli. Ability to detect changes in the environment also enables organisms to obtain resources in their environment.
h) Movement
Movement refers to change is position (displacement) of a part or parts of an organism. Movement in plants includes folding of leaves, closing of flowers and growing of shoots towards light. The change of position of an entire organism from one position to another is locomotion.
Study questions
a) Motor vehicles move, use energy and produce carbon dioxide and water. Similar characteristics occur in living organisms yet motor vehicles are not classified as living. List the other characteristics of living things that do NOT occur in motor vehicles.
b) Give the name to the study of:
Collection of Specimen
We have defined biology as the study of living things. For effective study, a biologist may have to collect some living things or some parts of living things for observation and analysis. The living things or parts of living things that are used for biological study are called specimens.
Biological studies always take place in laboratories. A laboratory is a building or a room that is designed and equipped for scientific studies.
Collections of living things especially animals may not be very easy. Some of the animals are not easy to catch while some are quite dangerous. Knowledge on proper specimen collection and handling of is very important. We will discuss some of the apparatus used in specimen collection.
a) Sweep net- This is used for catching flying insects.
b) Fish net- This is used for trapping small fish and other small Water animals.
c) Pooter- This is used for sucking small animals from rock surfaces or barks of trees.
d) Bait trap- This is used for attracting and trapping small animals including rats.
e) Pit fall trap- This is used for catching crawling animals.
f) Pair of forceps- This is an apparatus used for picking up small crawling animals e.g. stinging insects.
g) Specimen bottles- These are bottles used for keeping collected specimen. They are of different sizes depending on the size of the specimen being studied.
h) Magnifying lens- This is used to enlarge small objects. A hand lens is a common magnifying lens used in the laboratory. The magnifying power of the hand lenses is always indicated on the lens e. g. X10, X5, X8. The magnifying power of a lens shows how many times the image will be enlarged compared to the object.
How to use a magnifying lens
To use a magnifying lens, place the object to be enlarged on the bench. Hold the magnifying lens on one hand and while closing one eye, move the lens towards the object until the image comes into clear focus.
If a magnifying lens is used to make a drawing of a specimen, the magnification of the drawing will have no relation with the size of the drawing.
The magnification of the drawing can be calculated using the formula shown below.
Drawing magnification: Length of drawing divided by Length of the actual object
The sign of “times” must come before the magnification value e. g. X10, X5, X15 etc.
Precautions During Collection and Observation of Specimen
While collecting specimen for observation, a biologist should play close attention to the following:
Comparison Between Plants and Animals
Plants
Animals
Chapter Two: Classification 1
Introduction
In particular, animals and plants are all living things yet they differ in many aspects. Amongst animals and plants also there exist a lot of differences.
There are millions of different plant and animal types exhibiting a range of differences. This created a need for a classification system of living things to make study of the living organisms easier.
External features of plants used in classification
External features of animals used in classification
Importance of Classification
Historical background of Classification
a) Edible or non edible
b) Flowering or non-flowering
Taxonomic Units of Classification
1. Kingdom
2. Phylum (animals)/division (plants)
3. Class
4. Order
5. Family
6. Genus
7. Species
All living organisms are classified into five major kingdoms:
a) Kingdom Monera- This is composed of microscopic unicellular organisms mainly bacteria e.g amoeba.
b) Kingdom Protoctista- This kingdom is comprised of members who are microscopic. Though, some are large enough to be seen with the naked eyes.
Members of this kingdom include algae and protozoa.
c) Kingdom Fungi- Members of this kingdom comprises the mushrooms, toadstools, moulds and yeast.
d) Kingdom Plantae- This kingdom comprises the moss plant, ferns, maize plants, hibiscus, meru oak tree etc.
e) Kingdom Animalia — Members of this kingdom include the tapeworms, hydra, fishes, human beings, lizards, earthworms etc.
In hierarchy of classification, a kingdom is further divided into several phyla (plural of phylum) or divisions (in plants). Within the phyla or divisions, organisms are further sorted out into groups known as classes based on their similarities and mode of life.
Each class is further subdivided into small groups called orders based on structural similarities. Orders subdivide into families which subdivide into genera (plural for genus).
Genera are then subdivided into smaller units of classification called the species.
Species is the smallest unit of classification whose members share many similarities and can freely interbreed to give rise to fertile or viable offspring.
Members of a particular species can, however, exhibit various differences e. g. differences in skin colour or body forms. Within the species, organisms can further be classified based on the differences in colour or forms.
In humans, this gives the races, in animals the term used is breed while in plants, variety is preferred. In bacteria, the term strain is used to describe the variant forms.
Members of different but very closely related species can breed but the resulting offspring will be sterile (infertile). In particular, a mule is a sterile offspring between a horse and a donkey.
Moving from kingdom to species, it is important to note that the number of organisms in each taxon decreases. The similarities, however, increase as one moves from kingdom to species.
Scientific Naming of Living Organisms
Rules of Binomial Nomenclature
Binomial nomenclature requires that:
a) The first part of the scientific name is that of the genus name which should begin with a capital letter. The second name is that of species. The species name should be written in small letters e. g.
a) Maize- Zea mays
b) Lion- Panthera leo
c) Leopard- Panthera pardus
d) Domestic dog- Canisfamiliaris
e) Human being- Homo sapiens
b) When printed in books and other printed works, the scientific names should be printed in italics. However, in handwritten manuscripts and typed works, the genus and species names should be lined separately.
Printed work- Homo sapiens
c) The specific name is frequently written with the name of the scientist who first adequately described and named the organism e. g. Balanus balanoides Linneaus. d) Scientists must give a latinised name for a newly described animal or plant species where a Latin name is missing e,g.
Aloe kilzfiensis- A type of aloe found in kilifi
Meladogyne kikuyuensis- A nematode found in kikuyu.
Origin of scientific names
Scientific names assigned to organisms can be:
Chapter Three: The Cell
Introduction
The Light Microscope
Magnification=Eyepiece magnification X Objective lens magnification
= 10 X 8
=X80.
Figure 1. The light microscope
Handling and Care of the Microscope
Part of the microscope: Limb
function: supports the body tube and stage
Base:
function: provides firm and steady support to the microscope
Body tube:
function: holds the eyepiece and the revolving nose piece
Coarse adjustment knob:
function: raises or lowers the body tube through longer distances to bring the image into sharper focus
Fine adjustment knob:
function: raises or lowers the body tube through smaller distances to bring the image into sharper focus. it is mostly used with the high power objective lens
Diaphragm:
function: an aperture that regulates the amount of light passing through the condenser to illuminate the specimen
Eye-piece:
function: contains a lens which contributes to the magnification of the specimen under review
Objective lens:
function: bring image into focus and magnifies it.
Mirror:
function: reflects light through the condenser to the object on the stage
Revolving nose piece:
function: holds the objective lenses in place and enables the change from one objective lens to the other
Condenser:
function: concentrates light on the object on stage
Stage:
function: flat platform where specimen on the slide is placed.it has two clips to hold the slide into position
The following rules should be observed when handling the microscope:
> Always use both hands when carrying the microscope. One hand should hold the base to provide support while the other hand holds the limb.
> Never place the microscope too close to the edge of the working bench or table.
> Do not touch the mirror or the lenses with your fingers.
> Dirty lenses should be cleaned using a special soft lens tissue paper or tissue paper moistened with ethanol. The other parts of the microscope may be cleaned using a microscope.
> Do not wet any part of the microscope.
> Make sure the low power objective lens clicks into position in line with the eye piece before and after use.
> After use, always clean and store the microscope in a safe place, free from moisture and dust.
How to use the Microscope
Cell Structures as seen under the Light Microscope
Figure 2 Plant and animal cells as seen under the light microscope
The cell as seen under the Electron Microscope
Figure 4. The plant cell
Structure and Functions of the Cell Organelles
Cell membrane
Cytoplasm
c) Mitochondrion
> Mitochondria are self replicative that is they can divide to form new ones.
Figure 5. The Mitochondrion (Animal)
Figure 6, (generalize(lmage23 mitochondrion Structure)
e) Ribosomes
f) Lysosomes
g)Golgi bodies/Golgi apparatus
1) They package and transport glycoproteins.
2) They are involved in secretion of synthesized proteins and carbohydrates.
3) They manufacture lysosomes.
Note: Golgi bodies are abundant in cells that are active in secretion. For instance pancreatic cells
which secrete enzymes and the nerve cells which secrete neurotransmitter substances.
h)Centrioles
i) Chloroplasts
j) Vacuoles
k) Cell wall
1. It gives plant cells their definite shape
2. It provides mechanical support and protection against mechanical injury.
3. The cell wall allows gases, water and other substances to pass through it.
i) Nucleus
Comparison between Plant Cells and Animal Cells
While there exist many similarities between plant and animal cells, there are a number of
differences.
Plant cells
Animal cells
Estimation of Cell Size
The light microscope can be used to estimate the size of a cell. Most cells have diameters
smaller than a millimeter. Due to this, cell sizes are always measures in smaller units.
These are micrometres and nanometers. These units of measurements are related as
shown below.
1 millimeter (mm) = 1000 micrometres (pm).
1 micrometer (pm) = 1000 nanometres (nm).
Procedure in cell size estimation
cell diameter = diameter of the field of view in micrometers divided by number of cells.
Cell Specialization. Tissues. Organs and Organ Systems
Cell Specialization/Cell Differentiation
Tissues
a) Tissue types in animals
1. Epithelial tissue- This is a thin continuous layer of cells for lining and protection of
internal and external surfaces.
2. Skeletal muscle- This is a bundle or sheets of elongated cells with fibres that can
contract. Its contraction and relaxation brings about movement.
4. Blood tissue- This is a fluid containing red blood cells, white blood cells and platelets.
The main functions of blood tissue are transportation of nutrients and gases as well as
protection of the body against infections.
5. Connective tissue- This tissue consists of strong fibres that connects other tissues and
organs thereby holding them in position.
b)Tissue types in plants
1. Epidermal tissue- This is a single thin layer of cells covering the outer surfaces. It
protects inner tissues of plants from mechanical damage and infection.
2. Palisade tissue- This is a group of cells rich in chloroplasts containing chlorophyll. It has
a site for the absorption of light energy and manufacture of food by photosynthesis.
3. Parenchyma tissue- This tissue consists of special thin walled irregularly shaped cells.
They form packaging and storage cells.
4.Conducting tissue/Vascular bundle- This tissue consists of xylem and phloem. Xylem
conducts water and dissolved mineral salts in a plant while phloem conducts food
substances in solution.
Organs
a) Heart- composed of connective, muscle, epithelial and blood tissues.
b) Kidney- Composed of connective, epithelial and muscle tissues
c) Brain- Composed of epithelial, connective tissues
d) Lungs- Composed of epithelial, connective tissues.
a) Roots- composed of epidermal, conducting and parenchyma tissues.
b) Flowers- This is composed of epidermal, conducting tissues.
c) Stem- Composed of conducting, parenchyma, and epidermal tissues and palisade
tissues in some cases
d) Leaves- Composed of palisade, conducting and epidermal tissues.
Organ system
This is a group of organs Whose functions are coordinated and synchronized to perform
the same function.
Organ systems are more pronounced in animals than in plants
Organ systems in animals include
a) Digestive system composed of organs such as oesophagus, stomach, intestines and
their associated glands.
b) Circulatory system composed of the heart, blood vessels (arteries, veins, capillaries).
c) Excretory this is composed of kidney, liver, and blood vessels.
d) Respiratory system composed of trachea, bronchus, and lungs.
e) Reproductive system composed of the reproductive organs and associated glands.
f) Nervous systems composed of the brain, spinal cord, eye, ear organs.
Chapter Four: Cell Physiology
Introduction
a) Chloroplasts play a vital role in carbohydrate synthesis.
b) Mitochondrion produces energy required to carry out life processes.
c) Ribosomes manufacture of proteins.
Structure of the membrane
Properties of the cell membrane
a) The cell membrane is semi permeable- The pores that occur on the cell membrane
allows the passage of the small size molecules but does not allow the passage of the large
sized molecules.
Such a membrane is said to be selectively permeable or semi-permeable.
In particular, when a cell is surrounded by a dilute sugar solution, the small sized water
molecules will enter the cell but the larger sugar molecules will not pass through the cell
membrane.
In contrast, the cell wall is permeable as it allows both sugar and water
molecules to pass through it; it has larger pores. This property of selectively permeability
enables the cell membrane to select what enters and leaves the cell.
b)The cell membrane is sensitive to changes in temperature and pH- Cell membranes
are made up of protein. Proteins are adversely affected by extreme changes in
temperature and pH.
Changes in temperature and pH will alter the structure of the cell
membrane thereby hindering the normal functioning of the cell membrane. High
temperature denatures (destroys) the proteins thereby impairing the functions of the cell
membrane.
c)The cell membrane possesses electric charges- The cell membrane has both positive
and negative charges. These charges affect the manner in which substances move in and
out of the ells. The charges also enable the cell to detect changes in the environment.
Physiological Processes of the Cell membrane
a) Diffusion
b) Osmosis
c) Active transport
Diffusion
Demonstration of the process of diffusion using_potassium manganate (VII)
Requirements: potassium manganate (VII) crystals, glass tubing, 100 cm3 beaker and water.
Procedure
a) Hold the glass tubing vertically in a beaker so that one end of the tubing rests on the
bottom of the beaker.
b) Cautiously and quickly drop a crystal of potassium manganate (VII) through the upper
opening of the glass tubing.
c) Close the upper hand of the glass tubing with the thumb.
d) Half fill the beaker with water.
e) Carefully withdraw vertically the glass tubing so that the crystal is left undisturbed at the
bottom of the beaker.
f) Record your observations for the first 15 minutes.
g) Explain your observations.
Expected observations
Explanation
The Role of Diffusion in Living Organisms
a) In Plants
Diffusion plays an important role in plants in that:
b) In Animals
In animals diffusion plays the following important roles
These
include the skin, gills, lungs, tracheal system and the cell membrane (in unicellular
organisms). Gaseous exchange at these surfaces occurs through the process of diffusion.
Factors affecting the rate of Diffusion
a) Diffusion gradient
b) Surface area to volume ratio
c) Thickness of membranes and tissues
d) Size of molecules
e)Temperature
Osmosis
Demonstration of Osmosis Using a Visking Tubing
Requirements
5OOcm3 beaker, visking tubing, a piece of thread, glass rod, concentrated sugar solution, 500 cm3
distilled Water.
Procedure
1. Into the beaker, put 350 cm3 of the distilled water.
2. Dip the visking tubing in water to moisten it. Open the visking tubing and tie one end
with the thread provided.
3. Half fill the visking tubing with the sugar solution provided and then tie the open end of
the tubing. Ensure no sugar solution spills out of the tubing.
4. Immerse the visking tubing into the distilled water in the beaker and suspend it using the
glass rod provided.
5. Leave the set up for about 30 minutes.
6. Record your observations.
7.Explain the observations made.
Observations
Explanation
Even though there is a higher concentration of sugar
molecules in the visking tubing, they were not able to diffuse out of the visking tubing
due to their large molecular sizes. The visking tubing is semi permeable.
Osmosis explained
Osmotic pressure
Osmotic potential
Water Relations in Animals
a) Red blood cell in hypotonic solution e. g. distilled water
When a red blood cell is placed in a hypotonic solution, water will move
into the cell through osmosis. The cell will swell and burst. Swelling of red blood cell
when placed in a hypotonic solution is referred to as haemolysis. The cell is said to be haemolysed.
b) Red blood cell in hypertonic solution
Water will, therefore, be drawn out of the cell into the hypertonic
solution. The cell will shrink and become small. The cell is said to be crenated.
The
process by which animal cells shrink and become smaller when placed in hypertonic
solutions is referred to as crenation.
c) Red blood cell in isotonic solution
When placed in an isotonic solution, the cell remains unchanged. This is because there
will be no net inflow or outflow of water between the cell and the solution.
Note:
This will prevent bursting or shrinking of the cells that
would otherwise impair their physiology.
Water Relations in Plants
a) Plant cell in hvpotonic solution e. g. distilled water
Wilting
Role of Osmosis in Organisms
As glucose accumulates in the guard cells, the osmotic pressure of the guard cells
increase making them to draw water from adjacent cells through osmosis. When the
guard cells become turgid, they bulge outwards leading to opening of the stomata.
Opening of the stomata is crucial as it allows for gaseous exchange in plants. At night,
there is no glucose synthesis.
The glucose available in the guard cells is respired on
leading to reduction of glucose and consequently reduction in osmotic pressure. The
guard cells lose turgidity and close the stomata.
The change in turgor pressure enables the special structures to rapidly close
thereby trapping the insects.
Factors Affecting the Rate of Osmosis
Active Transport
Some of these mineral salts cannot be absorbed by the
plants through diffusion. A mechanism that would move them into the cells against the
concentration gradient will be useful.
Role of active transport in living organisms
Factors affecting the rate of Active Transport
a) Oxygen concentration
Oxygen is required in respiration process that yields energy for active transport. Under low
oxygen concentration, the rate of respiration will be low hence there will be production of little
energy leading to low rate of active transport. Increase in oxygen concentration translates into a
higher energy production leading to high rate of active transport.
b) Change in pH
Change in pH affects the respiratory process which is enzyme controlled. Respiratory enzymes
require optimum pH for their efficient activity. Extreme pH conditions will increase lower the
rate of active transport since the enzymes controlling respiration Will be denatured.
c) Glucose concentration
Glucose is the chief respiratory substrate. At low glucose concentration, there will b less
production of energy leading to decreased rate of active transport. Rate of active transport
increases with increase in glucose concentration due to increase in the rate of energy production.
d ) Temperature
Temperature affects the enzyme controlled respiration process. At low temperatures, the
enzymes are inactive hence the rate of respiration will be low resulting into low rate of active
transport since there will be less production of energy. An increase in temperature increases the
rate of respiration since the enzymes become more activated. At temperatures beyond 40 degrees
celcius, the enzymes become denatured, respiration stops and so does active transport.
e) Presence of metabolic inhibitors e. g. cyanide.
These are substances which act as metabolic poisons. They stop the rate of respiration leading to
production of no energy. Active transport is, thus, stopped.
Nutrition Plants And Animals
Introduction
a) The nutrients are required for growth and development of the living organisms.
b) The nutrients are required for energy provision as they are broken down to release
energy.
c) They nutrients are also required for repair of worn out tissues
d) Nutrients are required for synthesis of very vital macromolecules in the body such as
hormones and enzymes.
Modes of nutrition
There are two main nutrition modes:
a) Autotrophism mode of nutrition through which living organisms manufacture their own
food from simple inorganic substances in the environment such as carbon (IV) oxide,
water and mineral ions. Organisms that make their own food through this mode are
autotrophs.
b) Heterotrophism mode of nutrition in which living organisms depend on already
manufactured food materials from other living organisms. Heterotrophs are the organisms
that feed on already manufactured food materials.
Autotrophism
In this mode of nutrition, organisms manufacture their own food from readily available
materials in the environment. These organisms use energy to combine carbon (IV) oxide,
water and mineral salts in complex reactions to manufacture food substances. Depending
on the source of energy used to manufacture the food, there are two types of
autotrophism:
a)Chemosynthesis
This is the process whereby some organisms utilize energy derived from chemical
reactions in their bodies to manufacture food from simple substances in the environment.
This nutrition mode is common in non green plants and some bacteria which lack the sun
trapping chlorophyll molecule.
b) Photosynthesis
Importance of Photosynthesis
1. Photosynthesis helps in regulation of carbon (IV) oxide and oxygen gases in the
environment.
2. Photosynthesis enables autotrophs make their own food, thus, meet their nutritional
requirements.
3. Photosynthesis converts sunlight energy into a form (chemical energy) that can be
utilized by other organisms that are unable to manufacture their own food.
External leaf structure
This helps reduce the rate of water
loss in such plants. However, the plants in areas of water abundance have broad leaves to
enable them lose the excess Water.
a) Cuticle
Functions of the cuticle
a) Being waterproof, it minimizes water loss from the leaf cells to the environment through
transpiration and evaporation.
b) It protects the inner leaf tissues from mechanical damage.
c) It prevents entry of pathogenic microorganisms into the leaf.
b) Epidermis
Functions of the epidermis:
a) It protects the leaf from mechanical damage.
b) It also protects the leaf from entry of disease-causing microorganisms.
c) It secretes the cuticle.
Adaptations of the guard cells
c) Palisade mesophyll
d) Spongy mesophyll layer
e) Vascular bundle/tissue
Chloroplast
Adaptations of the leaf to photosynthesis
Raw materials for photosynthesis
Conditions for photosynthesis
Photosynthesis Process
a)Light reaction/Light stage
i) Photolysis of water
Water-- Hydrogen atoms + Oxygen gas
ii) Formation of adenosine triphosphate (ATP)
ADP + P = ATP
b) Dark reaction/Dark stage
Testing for starch in a leaf
Requirements
Procedure
Observations
Factors affecting the rate of photosynthesis
a) Carbon (IV) oxide concentration
At this point, other factors such as light intensity, water and temperature
become limiting factors.
b)Light intensity
c)Temperature
Rate of
photosynthesis is optimum at (35-40) °C. Beyond 40°C the rate of photosynthesis
decreases and eventually stops since the enzymes become denatured.
d) Water
Experiment to investigate the gas produced during photosynthesis
Requirements
Procedure
a) Set up the apparatus as shown in the figure below
b) Place the set up in the sunlight to allow photosynthesis to take place.
c) Leave the set up in the sun until sufficient gas has collected in the test tube.
d) Test the gas collected with a glowing splint.
e) Record your observations.
Note:
1) Carbon (IV) oxide concentration: Carry out the experiment using different
amounts of dissolved sodium hydrogen carbonate e. g 5 g, 10g, 15g, 20g and
examine the rate at which the gas collects.
2) Light intensity: An artificial light source can be used. Illuminate the plant and
vary the distance between the set up and the light source While recording the time
it takes for the gas jar to fill or counting the number of bubbles peer unit time.
3) Temperature: carry out the experiment at varying temperatures and record the
rate at which the gas collects.
Experiments on factors necessary for photosynthesis
Light
Requirements
Carbon (IV) oxide
Requirements
Procedure
Chemicals Of Life
Carbohydrates
Monosaccharides
Properties of Monosaccharides
Note:
Disaccharides
Properties of Disaccharides
Functions
Polysaccharides
Properties of polysaccharides
Examples of polysaccharides
a) Starch- Made by linking numerous glucose molecules. It is a form in which
carbohydrates are stored in plants.
b) Glycogen- Is a storage carbohydrate in liver and muscles of animals. It is broken down to
glucose in animals when blood glucose falls.
c) Cellulose- This is a structural polysaccharide in plants. It is a component of the cell wall
d) Chitin- A structural carbohydrate found in cell wall of fungi and arthropod exoskeletons
Functions of polysaccharides
Lipids
Properties of lipids
Functions
Proteins
a) Essential- These are those amino acids that cannot be synthesized by the body
systems hence have to be supplied in the diet.
b) Non essential- These are amino acids that can be synthesized by the body
mechanisms hence do not need to be supplied in the diet.
a) First class proteins- Contain all essential amino acids
b) Second class proteins- Proteins lack one or more essential amino acids
Protein synthesis
Properties of Proteins
Functions of proteins
a) They are structural compounds of the body. Cell membrane is protein in nature. Hair,
nails and hooves are made up of protein keratin.
b) Proteins are broken down to release energy during starvation when all carbohydrate and
lipid reserves are depleted.
c) Functional proteins play vital roles in metabolic regulation. Hormones are chemical
messengers while enzymes regulate the speed of metabolic reactions.
d) Proteins such as antibodies provide protection to the body against infections
e) Some protein molecules are transport molecules. Haemoglobin molecule plays a crucial
role in transportation of respiratory gases.
f) Proteins play a vital role in blood clotting e. g. fibrinogen.
g) Contractile proteins such as actin and myosin bring about movement.
Enzymes
What are enzymes?
Types of enzymes
a) Extracellular: Are produced within the cells but used outside the cells e. g. digestive
enzymes.
b) Intracellular: Are enzymes produced and used within the cells e. g. respiratory enzymes.
Importance of Enzymes
Enzyme nomenclature
a).Trivial naming
Examples
b). Use of suffix -ase
Substrates
Processes/Reactions
Hydrolysis .................... ..hydrolase
Reduction ..................... ..reductase
Oxidation ...................... ..oxidase
Mechanism of action of Enzymes
Properties of Enzymes
Factors affecting enzyme activity
a)Temperature
b)pH
c)Enzyme Specificity
d)Substrate Concentration
e) Enzyme Concentration
f) Enzyme co-factors
g) Co-enzymes
Examples
NAD- Nicotine Adenine Dinucleotide.
FAD- Flavine Adenine Dinucleotide.
NADP- Nicotine Adenine Dinucleotide Phosphate.
h) Enzyme inhibitors
1. Competitive
2. Non- competitive
Competitive inhibitors
Non competitive inhibitors
Examples of non competitive inhibitors
Heavy metals (such as lead, mercury, silver), Cyanide, organophosphates such as malathion.
Heterotrophism
Modes of Heterotrophism
a) Parasitism
b) Symbiosis
> Rhizobium and leguminous plants: rhizobium fixes nitrogen for the legume while
the bacteria obtains manufactured food from the legumes.
> Lichen: association of fungi (absorbing water and nutrients) and algae
(manufacturing food for the association.
> Catalase digesting bacteria and ruminants.
Dentition
Types of Dentition
a) Incisors
a. Canines
b. Premolar and molar
Classes of Holozoic Heterotrophs
a) Herbivores: heterotrophs that exclusively feed on vegetation.
b) Carnivores: heterotrophs exclusively feed on flesh.
c) Omnivores: heterotrophs that feed on both flesh and vegetation.
Dental Formula
a) i-incisors.
b) c-canines.
c) pm-premolars.
d) m-molars.
a) Write down its dental formula.
b) State its mode of feeding.
c) Give a reason.
Herbivores
Carnivores
Dental Diseases
a) Dental Carries
b) Periodontal Diseases
Are of two types:
a) Gingivitis- Characterized by reddening of gums, bleeding and pus in the gums.
b) Pyorrhea- The teeth become loose due to infection of the fibres holding the teeth in
the sockets.
Dental Hygiene
Digestion
Digestion in the mouth
a) Sublingual salivary gland; beneath the tongue
b) Sub mandibular gland: under the jaw
c) Parotid gland: Found in the cheeks in front of the ears.
Digestion in the stomach
a) Pepsinogen-This is activated to pepsin which breaks down proteins to peptides.
b) Rennin- Digests caseinogens protein in milk to casein (curd).
e) Hydrochloric acid- This:
d) Mucus- Forms a protective barrier to the stomach wall against corrosion by the
HC1. Mucus is secreted by goblet cells in the epithelial membrane of the
alimentary canal.
Duodenum
a) Gall bladder in the liver- Secretes bile.
b) Pancreas- Secrete hormones and digestive enzymes.
i. Secretin hormone from the pancreas: Secretin stimulates secretion of pancreatic
juice into the duodenum
ii. Cholecystokinin from the duodenal wall: This stimulates secretion of bile from
the gall bladder.
a) Pancreatic amylase- This facilitates breakdown of the remaining starch into maltose
b) Trypsin- Digests proteins into peptides.
c) Pancreatic juice-Digests lipids into fatty acids and glycerol
d) Sodium hydrogen carbonate- This:
Provides alkaline medium for activity of the duodenum enzymes.
i. Aid in emulsification (breakdown of fat molecules into tiny fat droplets to
increase surface area for digestion).
ii. The salts also provide a suitable alkaline medium for action of the duodenal
enzymes.
iii. In addition they neutralize the acidic chyme.
Digestion in the ileum
a) Maltase: speeds up breakdown of maltose to glucose
b) Sucrase: speeds breakdown of sucrose to glucose and fructose
c) Peptidase: speeds breakdown of peptides to amino acids
d) Lipase: speeds breakdown of lipids to fatty acids and glycerol.
e) Lactase: speeds breakdown of lactose to glucose and galactose.
f) Polypeptidase: speeds breakdown of plypeptides into amino acids
Note:
The mucus secreted by the goblet cells lubricates food along the alimentary canal and
also protect the canal from being digested by enzymes.
At the end of digestion in the ileum, the resulting watery emulsion is called chyle; it
contains soluble end products of digestion ready to be absorbed.
Absorption
a) It is long to provide a large surface area for absorption
b) It has a narrow lumen so as to bring the digested food into close contact with the
walls of the ileum for easier absorption
c) It is highly coiled to slow down movement of food thus allowing more time for
digestion and absorption of food.
d) The inner surfaces have numerous villi and microvilli to increase surface area for
absorption of end products of digestion.
e) The epithelial lining is one cell thick to reduce the distance through which
digested food diffuses.
f) Has a dense network of blood capillaries into which digested food materials
diffuse to increase transport and thus maintain a steep concentration gradient.
g) Have lacteal vessels in the villi for absorption of fatty acids and glycerol.
Egestion
> This is the process through which the undigested and indigestible food substances are
eliminated from the body.
Caecum and Appendix
a) Glucose
b) Fatty acids and glycerol
c) Amino acids
Vitamins
a) Fat soluble vitamins- They dissolve in fats and are often stored in the liver.
Include Vitamins A, D, E, K.
b) Water soluble vitamins- Dissolve in water. Include vitamins B1, B2, B5, B12 and
C.
Vitamin A (retinol)
main food source
Vitamin B1 (thiamine)
main food source
uses in the body
deficiency disease symptoms
Vitamine B2 (riboflavine and nicotinic acid)
main food source
uses in the body
deficiency disease symptoms
Vitamin B5 (pentathonic acid)
main food source
uses in the body
deficiency disease symptoms
main food source
uses in the body
deficiency disease symptoms
Vitamin C (absorbic acid)
main food source
uses in the body
deficiency disease symptoms
Vitamin D (calciferol)
main food source
uses in the body
deficiency disease symptoms
Vitamin E (tosopherol)
main food source
uses in the body
deficiency disease symptoms
Vitamin K (quinone)
main food source
uses in the body
deficiency disease symptoms
Mineral salts
a) Macro-nutrients: Nutrients required in large quantities. These include nitrogen,
sulphur, phosphorous, calcium, sodium, iron and magnesium.
b) Micro-nutrients: Nutrients required in small quantities. Include copper,
manganese, boron, iodine and cobalt.
Element: Nitrogen
source
function in the body
deficiency symptoms
-
Element: Phosphorous
source
function in the body
deficiency symptoms
Element: Calcium
source
function in the body
deficiency symptoms
Element: Iodine
source
function in the body
deficiency symptoms
Element: Potassium
source
function in the body
deficiency symptoms
Element: Iron
source
function in the body
deficiency symptoms
Element: Sodium
source
function in the body
Element: Chlorine
source
function in the body
Element: Sulphur
source
function in the body
Element: Magnesium
source
function in the body
deficiency symptoms
Roughage
Importance of roughage
a) It rubs against the walls of the alimentary canal stimulating secretion of digestive
enzymes and mucus to lubricate the epithelial lining.
b) Roughage enhance peristalsis since as they rub against the walls of the alimentary canal,
they stimulate contraction and relaxation of the muscles.
c) Roughage is an absorbent; it extracts water from the alimentary canal making the fecal
matter bulky and moist hence can be easily propelled by peristaltic movements. This
prevents constipation.
Factors affecting energy requirements in humans
Discuss how the following factors affect energy requirements in humans:
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