Glucose
Amino Acids
Plasma proteins
Urea
In organic ions
90 0.1 0.05 8.0 0.03 0.72 | 90 0.1 0.05 0 0.03 0.72 | 94 0 0 0 2.0 1.5 | - Name the process responsible for the formation of glomerular filtrate.
- What process is responsible for the absence of glucose and amino acids in urine?
- Explain why there are no plasma proteins in the glomerular filtrate
- Besides plasma proteins what other major component of blood is absent in the glomerular filtrate.
- Why is the concentration of urea in urine much higher than its concentration in the glomerular filtrate?
- When the environmental temperature is very high, some animals urinate on their legs or lick the sides of their body. How does this help in temperature regulation?
- Fish are able to use more of their food intake for growth than mammals. Suggest an explanation for this.
- Explain the term negative feedback
- Name the blood vessels labeled A, B and C.
- Amino acids
- Carbon (IV) oxide
- During fasting, the level of blood glucose in vessels C may be higher than the level in vessel B explain
- Describe how the human kidney functions. ( 20 marks)
Biology Form 3 Topical Revision Questions and Answers (4)
For the preparation of national and local exams, get biology form 3 topical revision questions with answers for free .
These biology topical revision questions are aggregated from the various high school KICD approved textbooks, including KLB biology form 3, Finder biology form 3, Mentors biology form 3, Spotlight biology form 3, Moran biology form 3, Pearsons biology form 3, etc.
The form 3 biological concepts that you can revise with these topical revision questions include;
You can get the topical revision questions for free without having to pay a cent on our Easy Elimu Study App , which you can get from Google Playstore here .
As a bonus, if you need to refresh your knowledge on a topic, EasyElimu has summarized notes, so you wonât have to stress over looking for notes , which makes passing that summative biology form 3 term 3 exam easy.
Whether itâs term 1, 2 or 3, these free biology form 3 revision topical questions will give you that grade A.
Classification II Questions and Answers - Biology Form 3 Topical Revision
- State two ways in which some fungi are harmful to man ( 2 marks)
- Parts labeled A and B ( 2 marks)
- The division which the plant belongs ( 1 mark)
- An organism with an exoskeleton, segmented body, two pairs of legs per segment, a pair of eyes and a pair of eyes and a pair of short antennae belongs to the phylum ( 1 mark)
- When are two organisms considered to belong to the same species? ( 2 marks)
- A student caught an animal which had the following characteristics; - Body divided into two parts - Simple eyes - Eight legs The animal belongs to the class ( 1 mark)
Class | Organisms | Reasons |
Insecta | | |
Myriapoda | | |
Arachnida | | |
- State two characteristics features of members of division bryophyte (2 marks)
- State two ways in which some fungi are beneficial to humans ( 2 marks)
- Other than having many features in common state the other characteristics of species ( 1 mark)
- Beside the abdomen, name the other body part of members of arachnida (1 mark)
- Name the phylum whose members possess notochord. ( 1 mark)
- Name the class in the phylum arthropoda which has the largest number of individuals ( 1 mark)
- To which class does an animal with two body parts and four pairs of legs belong? (1 mark)
- Name two organisms that cause food spoilage ( 2 marks)
- Name two methods of food preservation and for each state the biological principal behind it. ( 2 marks)
- List two characteristics that mammals share with birds ( 2 marks)
- State two major characteristics that are unique to mammals ( 2 marks)
- What two characteristics distinguish animals in phylum chordata? ( 2 marks)
- Name the parts labeled A and B (2 marks)
- Name the division to which the plant belongs ( 1 mark)
- Which is the dominant generation of the plant in the diagram? (1 mark)
- State three characteristics of the organisms in the division named (b) above?
- What three characteristics are used to divide the arthropods into classes? (3 marks)
- Write two differences between algae and fungi ( 2 marks)
- Give the economic importance of algae ( 1 mark)
- What is alteration of generations? ( 3 marks)
- Name two divisions in plant kingdom that shows alternation of generation (2 marks)
- A millipede, grasshopper and crayfish all belong to phylum arthropoda. Mention three major characteristics that they have in common. (3 marks)
- Identify two errors that have been made when writing the name
- What is the species name of Irish potato?
- An ecologist came across a plant with the following characteristics, green in colour, non- flowering, compound leaves and sori on the underside of the leaflets. State the probable division of the plant. ( 1 mark)
- An organism with an exoskeleton, segmented body, two pairs of legs per segment, a pair of eyes and a pair of short antennae belongs to the class ( 1 mark)
- List the main characteristics that are used to sub- divide arthropods into classes (2 marks
- Name the main method of reproduction among bacteria. ( 1 mark)
Ecology Questions and Answers - Biology Form 3 Topical Revision
- State how excessive use of pesticides may affect soil fertility
Lakes | Mean body length (cm) | Type of water | Amount of plant life | Inveertebrate biomass (g/cm ) |
Insects | Snails | Crabs | Worms |
A B C D | 31.2 28.6 18.4 16.3 | Hard Hard Soft Soft | 1050 950 1.2 0.5 | 11 72 97 99 | 300 100 0 0 | 10 9 2 1 | 180 90 20 10 |
- Describe the procedure that may have been used to determine the mean body length of the fish ( 6 marks)
- What are the likely reasons for the difference in the mean body length of the fish living in lakes A and D? ( 4 marks)
- Suggest one reason for the absence of snails in lakes C and D? (1 mark)
- Name any six abiotic (physical) factors that are likely to influence the plant and animal life in lake A. ( 3 marks)
- Explain how each of the factors named in (i) may influence the plant and animals life in Lake A. ( 6 marks)
- From this record of observations construct a feed web (5 marks)
- Bird species as a secondary consumer (1 mark)
- Large fish as tertiary consumer (1 mark)
- The biomass of the producers in the lake was found to be greater than that of primary consumers. Give an explanation for this observation? (1 mark)
- Two organisms that compete for food in the lake. (2 marks)
- The source of food the organisms in d (i) above compete for (1 mark)
- State three ways by which many may interfere with this lake ecosystem ( 3 marks)
- Explain how each of the ways you have states may affect life in the lake? ( 6 marks)
- Plant A ( 1 mark)
- Plant B ( 1 mark)
Fish species | Fish population during the period |
1964 | 1966 | 1969 | 1970 | 1971 | 1972 | 1973 |
A B C D | 6102 208 36 4521 | 223 30 100 272 | 26 11 0 23 | 106 22 0 27 | 660 63 0 79 | 4071 311 0 400 | 7512 405 0 617 |
- In which year were the fish populations lowest?
- State the factors that might have caused the lowest fish populations during the year you have stated in (a) (i) above ( 3 marks)
- Explain how each factor you have stated in (a) (ii) above could have brought about the changes in fish populations (11 marks)
- What is the difference in the rate of population recovery of species A and D? (1 mark)
- Suggest two biological factors that could have led to this difference (2 marks)
- State a method that might have been used to estimate the fish population in the lake ( 1 mark)
- State one disadvantage of the method you have stated in (c) (i) above (1 mark)
- Industrial wastes may contain metallic pollutants. State how such pollutants may indirectly reach and accumulate in the human body if the wastes were dumped into rivers.
- State three measures that can betaken to control infection of man by protozoan parasites ( 3 marks)
- Construct two food chains ending with a tertiary consumer in each case (2 marks)
- Which organisms has the largest variety of predators in the food web? (1 mark)
- Name secondary consumers in the food web ( 2 marks)
- Suggest three ways in which the ecosystem would be affected if there was prolonged drought ( 3 marks)
- Calculate the population size of the crabs in the lagoon using the formula below N = n x M M Where N= Total population of crabs in the lagoon n= Total number of crabs in the second catch M= Number marked crabs during the first catch M= Number of marked crabs in the second catch. ( 2 marks)
- State two assumptions that were made during the investigation ( 2 marks)
- What is the name given to this method of estimating the population size? (1 mark)
- Write down the food chains in which the guinea fowls are secondary consumers (1 mark)
- What would be the short term effects on the eco- system of lions invaded the area? ( 3 marks)
- Name the organisms through which energy from the sun enters the food web. (1 mark)
- Name the organisms that causes processes E and J ( 2 marks)
- Name the processes represented by F and H (2 marks)
- Name the group of organisms represented by c (i)
- Distinguish between a community and a population (2 marks)
- Describe how a population of grasshopper in a given area can be estimated (5 marks)
- Explain how the various activities of man have caused pollution of air ( 20 marks)
- Explain how birds of prey are adapted to obtaining their food ( 2 marks)
- Name the crop infested by phytophthora infestants and the disease it causes Crop - Disease -
- State four control measures against the diseases ( 4 marks)
- Explain why the carrying capacity for wild animals is higher than for cattle in a given piece of land ( 2 marks)
- Autecology ( 1 mark)
- Synecology ( 1 mark)
Leaf | Number of stomata |
Upper epidermis | Lower epidermis |
A B C | 300 150 02 | 0 200 13 |
- State the modification found in the stomata of leaf C
- Name the organism that causes amoebic dysentery.
- Name the process through which energy from the sun is incorporated into the food web ( 1 mark)
- State the mode of feeding of the birds in the food web (1 mark)
- Name two ecosystem in which the organisms in the food web live( 2 marks)
- From the information in the food web construct a food chain with the large bird as a quarter â nary consumer ( 1 mark)
- What would happen to the organisms in the food web if bird N migrated?
- Not all energy from one trophic level is available to the next level. Explain (3 marks)
- Two organisms, which display a role in the ecosystems, are not included in the food web. Name them. ( 1 mark)
- State the role played by the organisms named g (i) above. (1 mark)
- State three human activities that would affect the ecosystems ( 3 marks)
- How would the activities stated in h (i) above affect the ecosystems? (3 marks)
- How is aerenchyma tissue adapted to its functions? ( 2 marks)
- Explain how abiotic factors affect plants ( 20 marks)
- Distinguish between pyramid of numbers and pyramid of Biomass (2 marks)
- Give three reasons for loss of energy from one trophic level to another in a food chain. ( 3 marks)
- Describe how the belt transect can be used in estimating the population of a shrub in a grassland ( 2 marks)
- Distinguish between population and community ( 2 marks)
- Fish in a pond ( 1 mark)
- Black jack in a garden ( 1 mark)
- State two ways in which schistosoma species is adapted to parasitic mode of life
- Describe causes and methods of controlling water pollution ( 20 marks)
- What is biological control of population growth? ( 2 marks)
- Describe one example where biological control has been used successfully (2 marks)
- Explain why the number of predators in nay ecosystem is less than the number of their prey ( 1 mark)
- Antelopes are more commonly found in open grassland while giraffe while giraffes are commonly found in wooded areas. ( 2 marks)
- In the savannah there is a wider variety of herbivores in wooded areas than in open grassland ( 1 mark)
- Removal of predators for an herbivore may in the long run lead to a decrease in its population
- Explain why primary productivity decreases with depth in aquatic environments. (2 marks)
- Identify the compound named A ( 1 mark)
- Name the processes X _________________ Y _________________ Z _________________
- In what form is nitrogen found in plants and animals?
Diet | Percentage of birds |
Forest | Savannah |
Insects only Vertebrates Seeds Fruits Other plant materials Number | 60 10 5 25 5 120 | 50 10 20 10 5 60 |
- Fruits found in forest and savannah ( 2 marks)
- Seed found in forest and savannah ( 2 marks)
- State two factors that may cause this difference in (a) above ( 2 marks)
Year | Month | Species A | Species B |
1998 1998 1998 1998 1998 1998 1998 1998 1998 1998 1998 1998 | July August September October November December January February March April May June | 96 79 75 87 - 99 129 96 99 79 135 104 | 240 590 900 750 230 80 200 330 300 320 90 450 |
- Which species show more fluctuation in numbers? ( 1 mark)
- Suggest an explanation of this ( 3 marks)
- Suggest two ways by which the savannah environment can be destroyed and how it can be conserved ( 4 marks)
Reproduction in Plants and Animals Questions and Answers - Biology Form 3 Topical Revision
- At what stage of mitosis do chromosomes replicate to form daughter chromatid? (1 mark)
- Fill in the blank spaces in the statement below After fertilization of an ovule _________ develops into a testa and _________ develops into a testa and _____________ develops into endosperm. ( 2 marks)
- State the difference between the composition of maternal blood entering the placenta and material blood leaving the placenta ( 3 marks)
- After four months of pregnancy the ovaries of a woman can be removed without terminating pregnancy. However during the first four months of pregnancy the ovaries must remain intact if pregnancy is to be maintained. Explain these observations ( 3 marks)
- Name two mechanisms that prevent self pollination in flowers that have both male and female parts ( 2 marks)
- State three characteristics that ensure cross pollination takes place in flowering plants ( 3 marks)
- Give a reason why it is necessary for frogs to lay many eggs ( 1 mark)
- What is the likely agent of pollination of the flower? ( 1 mark)
- What is the significance of the long feathery stigma in the flower ( 1 mark)
- State two ways by which the human Immuno Deficiency virus (HIV) is transmitted other than sexual intercourse? ( 2 marks)
- Explain why sexual reproduction is important in organisms ( 3 marks)
- State two disadvantages of self- pollination ( 2 marks)
- What type of cell division takes place at Z? ( 1 mark)
- Where in the body of a female does process Z occur? ( 1 mark)
- On the chart indicate the position of parent and gametes ( 2 marks)
- Epigynous flower ( 1 mark)
- Staminate flower (1 mark)
- How are the male parts of wind- pollinated flowers adapted to their function? (4 marks)
- Seed (1 mark)
- Fruit (1 mark)
- State two processes which occur during anaphase of mitosis ( 2 marks)
- What is the significance of meiosis? (2 marks)
- Protoandry ( 1 mark)
- Self- sterility ( 1 mark)
- Give three advantages of cross- pollination ( 3 marks)
- Name the part labeled S ( 1 mark)
- Name the types of blood vessels found in the structure labeled Q (2 marks)
- State the difference in composition of blood in the vessels named (b) (i) above ( 2 marks)
- Name two features that enable the structure labeled P carry out its function (2 mark)
- State the role of the part labeled R ( 1 mark)
- Identify the stage of cell division ( 1 mark)
- Give three reasons for your answer (a) (i) above ( 2 marks)
- Name the structure labeled M ( 1 mark)
- State two disadvantages of sexual reproduction in animals ( 2 marks)
- Protandry ( 1 mark)
- Name the parts labeled Q, R, and S ( 3 marks)
- State two functions of the pollen tube ( 2 marks)
- On the diagram, label the micropyle ( 1 mark)
- Describe how insect pollinated flowers are adopted to pollination (6 marks)
- Luteinizing hormone ( 3 marks)
- Describe the role of hormones in the human menstrual cycle (20 marks)
- Nutrition of the embryo
- Protection of the embryo ( 4 marks)
Growth and Development Questions and Answers - Biology Form 3 Topical Revision
- Explain why several auxiliary buds sprout when a terminal bud in a young tree is removed.
- Account for loss in dry weight of cotyledons in a germinating bean seed.
- What is the effect of gibberellins on shoots of plants?
- What was the aim of the experiment?
- What would be the expected results at the end of the experiment?
- State two advantages of metamorphosis to the life of insects
- During germination and early growth, the dry weight of endosperm decreases while that of the embryo increases. Explain
- What was this set up supposed to investigate?
- Why was pyrogallic acid included in glass jar A?
- Explain why glass jar C and D were included in the experiment
- What result would you expect in glass jar A and B at the end of the experiment?
- State two artificial ways of breaking seed dormancy
- Give reasons for the development of the lateral braches after the removal of the apical bud
- Suggest one application of this practice
- What is the importance of this practice?
- Suggest the expected changes in the composition of gases in the flask on the fifth day
- Give four reasons for your answer in (a) above
- Name two factors that cause dormancy in seeds
- Distinguish between epigeal and hypogeal germination (1 mark)
- Why is oxygen necessary in the germination of seeds? (2 marks)
Time (days) | Length of bbranches in mm |
Shoot A | Shoot B | Shoot C |
0 | 3 | 3 | 3 |
2 | 10 | 12 | 3 |
4 | 28 | 48 | 8 |
6 | 50 | 90 | 14 |
8 | 80 | 120 | 20 |
10 | 118 | 152 | 26 |
- Using the same axes, draw graphs to show the length of branches against time (8 marks)
- What was the length of the branch in shoot B on the 7 th day? ( 1 mark)
- What would be the expected length of the branch developing from shoot A on the 11 th day? ( 1 mark)
- Account for the results obtained in the experiment ( 6 marks)
- Why was shoot C included in the experiment? ( 1 mark)
- What is the importance of gibberallic acid in agriculture? ( 1 mark)
- State two physiological processes that are brought about by the application of gibberellic acid on plants. ( 2 marks)
- State tow environmental conditions that can cause seed dormancy
- Name the part of a bean seed that elongates to bring about epigeal germination (1 mark)
- âTrue growth is not simply an increase in sizeâ State four different ways in which true may be defined.
- State two external factors, which influence growth in plants and describe one effect of each.
Name hormone | Site of hormone production | Effect |
| Thyroid gland | |
| | Maturation of Graafin follicles |
Auxins | | |
Gibberellins | | |
| Dry mass of ingeminated seeds | Dry mass of seedling after 10 days |
Cellulose Starch Other organic Material Ash | 2g 63g 13g 2g | 5g 9g 27g 4g |
Total dry mass | 80g | 45g |
- Why is dry mass used for comparison?
- How would one ensure that the drying process had been completed
- Account for the decrease in the total dry mass of the seedlings
- Why did the seedling contain more cellulose than the underminated seeds?
- What is the most likely source of the carbon used to form this new cellulose?
Biology Form 4 Topical Revision Questions and Answers (4)
For the preparation of national and local exams, get biology form 4 topical revision questions with answers for free .
These biology topical revision questions are aggregated from the various high school KICD approved textbooks, including KLB biology form 4, Finder biology form 4, Mentors biology form 4, Spotlight biology form 4, Moran biology form 4, Pearsons biology form 4, etc.
The form 4 biological concepts that you can revise with these topical revision questions include;
As a bonus, if you need to refresh your knowledge on a topic, EasyElimu has summarized notes, so you wonât have to stress over looking for notes, which makes passing that summative biology form 4 term 3 exam easy.
Whether itâs term 1, 2 or 3, these free biology form 4 revision topical questions will give you that grade A.
Genetics Questions and Answers - Biology Form 4 Topical Revision
- Giving a reason, name the nucleic acid to which the portion belongs. (2 marks) Name _________________________ Reason ________________________
- Write down the sequence of bases of a complimentary strand to that shown above (1 mark)
- State two structural differences between ribonucleic acid ( RNA) and deoxyribonucleic acid ( DNA) (2 marks)
- Name a disorder of human blood that is caused by mutation (1 mark)
- State the function of deoxyribonucleic acid (DNA) molecule (1 mark)
- Give a reason why it is only mutation in genes of gametes that influence evolution ( 2 marks)
- (Give a reason for the appearance of pink flower in the F1 generation ( 1 mark)
- If the plants from F1 generation were selfed, state the phenotype ratio of the F2 generation ( 2 marks)
- State two characteristics that researchers select in breading programmes. (2 marks)
- Give an example of sex- linked trait in humans on; ( 2 marks) Y chromosome __________________ X chromosome __________________
- Using appropriate letter symbols, work out the genotype of the F1 generation. ( 4 marks)
- Genotype ratio ( 2 marks)
- Phenotype ratio ( 1 mark)
- Wrinkled number ( 1 mark)
- Work out the genotype of F1 generation ( 3 marks)
- If the plants from F1 generation were selfed, what would be the phenotypic ratio of the F2 generation? ( 3 marks)
- What is the genetic explanation for the absence of plants with red and white in the flower F1 generation? ( 2 marks)
- Identify the recessive character. Give a reason
- What were the genotypes of the parent plants that give rise to the plants with red and white flowers?
- If the white flowers were selfed, what would be the genotypes of their offspring?
- Name two disorders in humans caused by gene mutation (2 marks)
- Inversion ( 2 marks)
- Translocation
- In mice the allele for black fur is dominant to the allele for brown fur. What percentage offspring would have brown fur from a cross between heterozygous black mice and brown mice? Show your working. Use letter B to represent the allele for black colour. ( 4 marks)
- What is meant by the term allele? ( 1 mark)
- Deletion ( 1 mark)
- Inversion ( 1 mark)
- What is a test- cross? ( 1 mark)
- Using letter G to represent the gene for purple colour, work out the genotypic ratio of the offspring ( 5 marks)
- State the phenotype of the offspring ( 1 mark)
- What is genetic engineering? ( 1 mark)
- State why the calf is light red and not dark red or white
- If a light red bull is mated with a dark red cow, work out using appropriate letter symbols the probability of getting a light offspring
- What is meant by linked genes?
- In fruit flies (Drosophila) the gene for red eyes Âź is dominant over the one for white â eye (r). If a true breeding white â eyed male, all the offspring will be red eyed. However, if a true â breeding whiteeyed female is mated with a true- breeding red- eyed male, all the female offspring will be red â eyed. Explain this apparent contradiction.
- Work out the ratio of the expected phenotypes if a red- eyed female offspring from the cross- described in (i) above is mated with red- eyed males.
- Explain the term variation with reference to the study of genetics.
- Using relevant examples distinguish between discontinuous variation and continuous variation
- What is the importance of genetic variation?
- Describe one example where genetic variations has helped a species to survive
- What do the letters G, T , C and A represent?
- Giving your reasons state whether it is part of DNA or an RNA strand.
- Show the complementary DNA strand
- Show the complimentary RNA strand
- In human couples the sex of a baby is determined by the man. Explain this statement.
Evolution Questions and Answers - Biology Form 4 Topical Revision
- State the difference between Lamarckian and Darwinian theories of evolution
- Two populations of the same species of birds were separated over a long period of time by an ocean. Both populations initially fed on insects only. Later it was observed that one population fed entirely on fruits and seeds. Although insect were available. Name this type of evolutionary change.
- Explain why Lamarckâs theory of evolution is not accepted by biologists today
- State three pieces of evidence that support the theory of evolution. (3 marks)
- state two advantages of natural selection to organisms (2 marks)
- Fossils records
- Comparative anatomy
- Describe how natural selection brings about adaptation of a species to its environment (6 marks)
- Explain how the process of evolution may result to the formation of new species
- organic evolution (1 mark)
- continental drift (1 mark)
- Explain continental drift as an evidence of evolution (3 marks)
- What is a test- cross? (2 marks)
- Give a reason why organisms become resistant to drugs (1 mark)
- Homologous structures
- Analogous structures (4 marks)
- What is meant by natural selection?
- Explain the role played by mutation in evolution (5 marks)
- Hybrid vigour
- The peppered moth exists in two varieties, which are genetically controlled. The dark variety is found predominantly in industrial cities and the white variety is found predominantly in rural areas. Explain how this pattern of distribution supports the theory of evolution by natural selection (6 marks)
- Special creation (2 marks)
- Organic evolution (2 marks)
Reception, Response and Co-ordination Questions and Answers - Biology Form 4 Topical Revision
- State one structural and one functional differences between motor and sensory neurons Structural differences Functional differences ( 2 marks)
Hormone | Site of production | Function |
Oestrogen | | |
Aldosterone | | |
- With an arrow, indicate on the diagram the direction of the impulse through the neurone ( 1 mark)
- State the functions of parts labeled P and Q ( 2 marks)
- How are structures of the human eye adapted to their functions (14 marks)
- State three defects of the eye and how each can be corrected (6 marks)
- State the changes that occur in a nerve axon to produce an action potential (3 marks)
- In an accident a victim suffered brain injury. Consequently he had loss of memory. Which part of the brain was damaged? ( 1 mark)
- Name the parts labeled B and C ( 2 marks)
- State three functions of the part labeled A ( 3 marks)
- State what would happen if the part labeled B was damaged. ( 1 mark)
- Tympanic membrane ( 3 marks)
- Eustachian tube ( 1 mark)
- Ear ossicles ( 2 marks)
- Describe how semi- circular canals perform their functions ( 2 marks)
- State the importance of tactic response among some members of Kingdom Protoctista? ( 1 mark)
- What name is given to response to contact with surface exhibited by tendrils and climbing stems in plants? ( 1 mark)
- State three biological importances of tropisms to plants (3 marks)
- Name the parts labeled X and Y ( 2 marks) X __________________________ Y __________________________
- Name the substance that is responsible for the transmission of an impulse across the synapse ( 1 mark)
- State the function of the ciliary muscles in the human eye. (1 mark)
- State two functional differences between the rods and cones in the human eye (2 marks)
- Ear ossicles
- Semi- circular canals
- Eustachian tube
- Where in the human body are relay neurons found? ( 1 mark)
- Name the neurone ( 1 mark)
- Name the parts labeled P and Q ( 2 marks)
- Name the hormone that is responsible for apical dominance (1 mark)
- What is thigmotropism? (1 mark)
- Describe the structure and functions of the various parts of the human ear (20 marks)
- Nocturnal animals such as the owl are capable of seeing fairly well at night What two retinal adaptations have made this possible? (2 marks)
- State two functions of the human ear? (2 marks)
- State four differences between co- ordination of the human eyeâs internal response to light and that of tropic movement of the flowering plant in response to light. (4 marks)
- What is the name of the response, which causes the twisted growth? (1 mark)
- Explain how the twisting process is accomplished (2 marks)
- Identify the state of leaves if the plant is autotrophic (2 marks)
- Euglena is positively phototactic. Of what biological significance is this characteristics? (1 mark)
- State the function of acetylcholine (2 marks)
- Where in the human body is the relay neurone located? ( 1 mark)
- State three effects of nicotine to human health (3 marks)
- Colour vision
- Maintaining shape of the eyeball
- Change in diameter of the lens
Support and Movement in Plants and Animals Questions and Answers - Biology Form 4 Topical Revision
- State the function of the part labeled K and L ( 2 marks)
- State the region of the body in which the bone is found ( 1 mark)
- State two ways in which skeletal muscle fibres are adapted to the function (2 marks)
- Name the parts of the bone labeled K ( 1 mark)
- How do the muscles work to extend the arm? ( 3 marks)
| Biceps | Gut muscles |
(i) (ii) (iii) (iv) | | |
- Name the bone ( 1 mark)
- Name the type of joint formed by the bone at its anterior end with the adjacent bone (1 mark)
- Give a reason why the lumbar vertebrae have long and abroad transverse processes ( 2 marks)
- Name the three types of skeletons found in multicellular animals (3 marks)
- Describe how the cervical, lumbar and sacral vertebrae are suited to their functions (17 marks)
- Which bones articulate with the bone shown in the diagram at the notch? (2 marks)
- Name the cartilage between the bones of the vertebral column (1 mark)]
- State the function of the cartilage in (a) above ( 1 mark)
- How are xylem vessels adapted for support? ( 1 mark)
- Name the bones labeled X, Y, and Z ( 3 marks) X _______________________ Y _______________________ Z _______________________
- Name the substance found in the place labeled W (1 mark)
- State the function of the substance named in (b) (i) above
- Name the structure that joins the bones together at the joint (1 mark)
- State the differences between ball and socket joint and the one illustrated in the diagram above (1 mark)
- Name the structure at the elbow that performs the same functions as the patella (1 mark)
- State a characteristic that is common to all cervical vertebrae
- Name two tissues in plants that provide mechanical support (2 marks)
- Name the three types of muscles found in mammals and give an example of where each on of them is found
- State the difference between ball and socket and hinge joint (1 mark)
- State three functions of an insects exoskeleton (3 marks)
- Dorsal fin (1 mark)
- Pectoral and pelvic fins (1 mark)
- Caudal fin (1 mark)
- State the diagnostic features of the cardiac muscles (3 marks)
- Make a complete drawing of the girdle (1 mark)
- Name the bones that articulate with the pelvic girdle. In each case name the part that articulates with (2 marks)
- Distinguish between tendons and ligaments (2 marks)
- Explain what antagonistic muscles are and give an example (4 marks)
- Name three types of strengthening tissues found in plants (3 marks)
- Explain how the tissue in (a) above are adapted to their functions (3 marks)
- Name the three main types of joint ( 3 marks)
- Give an example of where each type of joint name in (a) above is found in the human body ( 3 marks)
- What makes young herbaceous plant remain upright? ( 2 marks)]
- Name three types of muscles found in the human body, state where each type is located and how each is adapted to its functions. ( 12 marks)
Discuss the various mechanisms that hinder self-pollination and self-fertilisation in plants - KCSE Biology Essay
Discuss the various ways in which anaerobic respiration is utilized in industries and homes - kcse biology essay, describe the defects that affect the mammalian eye and how they could be corrected - kcse biology essay.
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Biology Essays: form 1 - 4.
Chemistry Practical Form 1 - Form 4 KCSE Notes by Ndovu ni kuu
Aug 24, 2023
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About Biology Essays: form 1 - 4.
This application features form one to form four Kcse standardized biology essays
Biology Essays: form 1 - 4 features form one to form four Kcse standardized biology essays. The mobile software has assembled all biology essays within the the entire syllabus. The application is set to equip learners with knowledge, skills and expertise on how to tackle questions pertaining essays in Biology. The application features the following Biology essays:
1. Essay 1 - Adaptation of the Cell to its functions
2. Essay 2 - Animal & Plant cells adaptations.
3. Essay 3 - Mammalian body adaptations against infections.
4. Essay 4 - Higher plants adaptations to their functions.
5. Essay 5 - Adaptations of mammalâs teeth to their functions.
6. Essay 6 - beans and maize ingestion to their absorption.
7. Essay 7 - Adaptations of small intestines to their functions.
8. Essay 8 - Homeostatic functions of the liver in mammals.
9. Essay 9 - Conditions necessary for photosynthesis.
10. Essay 10 - Adaptations of Ileum to its functions.
11. Essay 11 - HOMEOSTASIS.
12. Essay 12 - Route taken by water from root to evaporation.
13. Essay 13 - Adaptations of mammalian heart to functions.
14. Essay 14 Double circulation in mammals.
15. Essay 15 - Process of Urine Formation in mammalian kidneys.
16. Essay 16 - Roles of Hormones during Homeostasis.
17. Essay 17 - Diabetes mellitus & Insipindus, glucose regulation.
18. Essay 18 - Effects of Abiotic factors on plants.
19. Essay 19 - Causes, Effects and Measures for water pollution.
20. Essay 20 - Xerophytes and Hydrophytes adaptations to habitats.
21. Essay 21 Differences between wind & Insect Pollinated flowers.
22. Essay 22 - Happenings in a flower from pollination to fruit Dvt.
23. Essay 23 - Adaptations of the Fenale Reproductive Human System.
24. Essay 24 - Gaseous Exchange Process in Terrestrial Plants.
25. Essay 25 - Gaseous Exchange adaptations in Mammals.
26. Essay 26 - Structure and Function of the mammalian Skin.
27. Essay 27 - Roles of hormones in the menstrual Cycle.
28. Essay 28 Secondary Growth.
29. Essay 29 Mechanisms of opening and closing of the Stomata.
30. Essay 30 - NATURAL SELECTION.
31. Essay 31 - Lamarck's and Darwin's Theories of Evolution.
32. Essay 32 - Adaptations of Blood components to their functions.
33. Essay 33 - Adaptations of Vertebrates to their functions.
34. Essay 34 - LOCOMOTION &
Adaptations of a fish.
35. Essay 35 - Supportive tissues in plants and adaptations.
36. Essay 36 REFLEX ACTION.
37. Essay 37 THE NITROGEN CYCLE.
38. Essay 38 - How Tropisms adapt plants to their habitats.
39. Essay 39 - Evidences of the organic Evolution.
40. Essay 40 - Structure and functions of parts of mammalian Ear.
41. Essay 41 - Ways in which Prey avoid their predators.
42. Essay 42 - Symbiosis and other relationships in an ecosystem.
43. Essay 43 - Parasites - Measures, prevention and control.
44. Essay 44 PROCESS OF MITOSIS.
45. Essay 45 Mechanisms that hinder selfpollination & fertilization.
46. Essay 46 - Adaptations of seeds & Fruits for dispersal.
47. Essay 47 - Mutations, mutants and mutagens.
48. Essay 48 - TRANSPIRATION.
49. Essay 49 - Adaptations of the mammalian Eye.
50. Essay 50 - Roles of hormones in plant growth and development.
51. Essay 51 - How Evolution may result to formation of new species.
52. Essay 52 Utilization of Anaerobic Respiration industries.
53. Essay 53 - DIGESTION..
54. Essay 54 - Factors affecting Enzyme Activities..
55. Essay 55 - Adaptations of the male reproductive systems in humans.
56. Essay 56 - Structure and functions of muscle tissues found in humans.
57. Essay 57 - Economic importance of kingdom monera and fungi.
58. Essay 58 - Adaptations of Nervous Systems to its functions.
59. Essay 59 Compositions and functions of mammalian blood.
60. Essay 60 - Effects affecting the human eye and their corrections.
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Free Biology Essay Examples & Writing Tips
Don’t know what to write about in your essay on biology? Looking for good biology essay examples for inspiration? This article has all you need!
A biology essay is a type of academic paper that focuses on a particular topic of biology. It can discuss animal life, cycles in biology, or a botanic subject. You will need to demonstrate your critical thinking skills and provide relevant evidence to support your perspective.
On this page, you will find examples of biology essays. You will also find here tips and topics prepared by our experts . They can assist you in nailing your short or extended essay.
Areas of Research for Biology Essays
If youâve been assigned to write a biology essay, you probably know which area of research you have to choose. However, it might be beneficial to explore other available scopes. Itâs useful for both interdisciplinary study and the cases when you are free to pick your area of research. In this section, letâs figure out what you can study in biology.
Here are biological areas of research you should be familiar with:
- Cancer Biology studies this type of disease to prevent, detect, diagnose and cure it. The ultimate goal of such biologists is to eliminate cancer.
- Cell Biology is a branch that studies the structure, function, and behavior of cells. Here, biologists study healthy and sick cells to produce vaccines, medication, etc.
- Biochemistry is an application of chemistry to the study of biological processes on cell and molecular levels. It is a cross-discipline between chemistry and biology. The focus is on the chemical processes of living organisms.
- Computation Biology is a study of biological data that develops algorithms and models to understand biological systems. Here, scientists either work for institutions or research for private enterprises.
- Genetics is an area that focuses on the study of genes and genetic variations for health benefits. It looks at the way DNA affects certain diseases.
- Human Disease is an area within which scientists study different diseases. The field covers cancer, developmental disorders, disease genes, etc.
- Immunology is a branch of biology that focuses on immunity. Immunologists look at the way the body responds to viruses as a way to protect the organism.
- Microbiology studies all living organisms that are too small for our eye to see. It includes bacteria, viruses, fungi, and other microorganisms.
- Neurobiology is the study of the nervous system. Biologists examine the way the brain works and look into brain illnesses.
- Stem Cell and Developmental Biology seeks to examine how the processes behind stem cellâs ability transform cells. The biologists in this area use the power of stem cells to model human illnesses.
Essay on Biology: Writing Tips
Want to know how to start a biology essay? Wondering about the best way to write your essay on biology? Then check out the following tips.
When youâre writing about biology, pay attention to the following features:
- Introduction . Just as in any other form of academic writing, the first section of your paper introduces the subject. Here, explain why your ideas are relevant to biology as a science.
- Thesis Statement. The final one or two sentences of the first paragraph should include your original hypothesis and experiment. You will be proving them in the main body. You do not have to include the results as the reader will encounter them later. If youâre struggling with this part, try our thesis generator .
- Main Body. In this part, write about all the experiments in detail. Often, teachers require to include visual aid to prove your point. For Zoology, Anatomy, Botany, it is pretty easy to find some photos and illustrations.
- Conclusion. Here, restate your thesis. Reemphasize the most critical aspects described in the main body. You can do it by using our summarizing tool . The goal of this last paragraph is to leave an everlasting impression on the reader.
Thank you for reading our article. We hope you found it helpful. Share it with your class peers who also study biology. Additionally, have a look at the biological essay examples below.
793 Best Essay Examples on Biology
Grass and its importance, the benefits of animals to humans essay.
Biology of Grasses: Description and Importance
Ubiquity of microorganisms.
Effects of Vinegar on the Germination Rate of Mung Beans Seeds
The Effect of Temperature on Amylase Activity
Anaerobic Respiration and Its Applications
Similarities and Differences of Photosynthesis and Cellular Respiration
Seed germination experiment: results and discussion, bronfenbrenner’s bioecological system theory.
Botany and Taxonomy of the Onion
Browning Reactions Explained
Dark or light skin: advantages and disadvantages, mitosis and meiosis in onion root tip.
Mung Seed Germination Patterns under Varying pH Values
Strawberries history.
Biology: Photosynthesis and Respiration
Pets and people, lemon, its origin and production.
Nanobiotechnology, Its Advantages and Disadvantages
Seed germination and osmosis.
Ubiquity of Bacteria: Laboratory Activity
Characteristics of Adult Development
The C-Fern Plant Laboratory Experiment
The Insect Effect on Human Life
The digestive system in the human body, vaquita – endangered species.
Different Ecosystems and Living Things
Importance of the brain in human body, substrate concentration and rate of enzyme reactions.
Vitamin A: Description and Usage
Eukaryotic and prokaryotic cells: key differences, transpiration process in plants, description of mitosis and meiosis, aspects, importance and issues of biodiversity, the function and structures of the human heart, co-evolution: angiosperms and pollinating animals, corn plant’s developmental stages, common biochemical cycles, mitosis in onion root and whitefish blastula, osmosis through a potato slice dipped in solutions of varying concentrations.
A Brief Discussion of Animal and Plant Cells
Vegetation monitoring from space.
Life in the Bottom of the Ocean and Its Protection
Dugesia, a Planarian With Its Peculiar Characteristics
Photosynthesis As A Biological Process
Microbial growth and effect of ph on it.
Psychophysics: Definition & Fundamentals
Consequences of Orange Juice on the Germination of Mung Bean Seeds
Understanding the effects of quantity of light on plants growth.
The Brain: Structure and Functions
Human circulatory system and evolution, responsible house plant keeping.
The Concept of Selective Breeding
Introduction to the Nervous System
Is earthworm beneficial or harmful to humans, cell counting and measurement under magnification.
Forensic Procedures: Hairs and Fibres
Photosynthesis and Cellular Respiration
Basic and applied biology: key differences, a study of the brine shrimps and their natural environment.
The Genus Rosa’s Adaptation to the Environment
Cell Organelles, Their Functions, and Disease
Marine Life in United Arab Emirates
Vertical Stratification
Earth atmospheric evolution.
Ethnobotanical Uses of Plants
Bacteria Cells Calculation and Categorization
The role of the olive in human history and lives.
Neuroethics, Its Meanings and Main Topics
The effect of acetone on wheat seed germination.
The Study of the Southern Hemisphere
The effect of habitat disturbance on invertebrate abundance and diversity.
The Process of a Prenatal Childâs Development
Biochemistry dogmas and their impacts on biotechnology, biology: analysis of egg experiment, the kingdom fungi: the structure, characteristics, the anatomy and physiology of the nervous system of a rat.
Archaea and Bacteria Prokaryotes Dichotomous Keys
Wildlife management and extinction prevention in australia.
Streptococcus Mutans: The Pathogen of Dental Caries
Biowarfare and Bioterrorism: History and Origin
Digestive journey of cheeseburger, rabbit muscular system dissection report, the characteristics and importance of nervous system.
Human Reproductive Biology: Organs, Structure, Functions
How the Human Eye Works Analogous to a Camera
Cell membrane modeling and cell membrane theory.
How the Skeletal Muscles Derive the Energy for Contraction
“The Egg and the Sperm Analysis” by Emily Martin
“the egg and the sperm” by emily martin critique.
Animal, Plant, and Bacterial Cells’ Cycles
Telescope and microscope discovery combo.
The Biological Basis of Sleep
The Human Family Tree Development
A light microscope: function and usage, the thermoregulation is and its importance, biology lab report: biodiversity study of lichens, living things: what do they have in common, homeostasis and regulation in the human body, microbiology: zygomycota, ascomycota and basidiomycota, rosalind franklin: the discovery of the dna structure, streptococcus pyogenes overview, non-trophic interaction in marine species, nervous system: the main functions, membrane hands-on laboratory report.
Digestion, Absorption and Assembly of Proteins
What Enzymes Are and How Do They Work
Climate change and threat to animals, what is mitochondria and what functions does it have.
Proteus Vulgaris Bacterium and Its Characteristics
Self-healing materials and their using.
Biosphere: Sydney in Australia
Description and General Information About Stink Bugs
Environmental microbiology overview.
The Euphorbia Plant Modification and Adaptation
Natural sciences. the phenol red broth test experiment.
Microbiological Methods for Assessing Soil Quality
Differences of Domesticated and Wild Animals and Plants
Microbiologist as a career in bioscience.
Home / Essay Samples / Science / Biology
Biology Essay Examples
The biological process of the cell cycle: the basis of life.
In my cell cycle essay, I aim to provide a comprehensive understanding of the different stages of the cell cycle and their regulation, including the role of key proteins such as cyclins and cyclin-dependent kinases (CDKs). The cell cycle is the process by which cells...
Overview of the Structure and Function of Cell Membrane
This Cell Membrane essay provides an overview of the structure and function of the phospholipid bilayer, embedded proteins, and cholesterol, along with the mechanisms of selective permeability and cell signaling. The cell membrane is a crucial component of every living cell. It separates the internal...
Chlamydia: Causes, Symptoms, Treatment, and Prevention
Chlamydia is a sexually transmitted bacterial infection caused by the bacterium Chlamydia trachomatis. It is one of the most common sexually transmitted infections and can affect both men and women. In this essay the topic of Chlamydia bacterial infection is revealed. Chlamydia is typically transmitted...
Analysis of the Cellural Respiration: the Process of Creating Enegry
Cellular respiration is the process by which cells convert glucose and oxygen into energy in the form of adenosine triphosphate (ATP). This process occurs in all living cells, and it is essential for the survival of all living organisms. The Cellular Respiration essay explores the...
Homeostasis: Deep Analysis of This Process
In this homeostasis essay I will be discussing why homeostasis is essential to normal functioning of human cells, tissues, organs and body systems. Homeostasis is the maintenance and regulation of a constant internal environment of an organism to create and provide the cells and enzymes...
Analysis of Heart Disease: Coronary Artery Disease
In the essay heart diseases we will have a closer look at such a widespread disease as coronory artery disease. It is one of the most common cardiovascular diseases in the United States. Aside from being common, it has resulted in the deaths of over...
Analysis and Observation of the Plant Experiment
The purpose of this plant essay-experiment is to get a greater understanding of all the factors that go into growing and keeping a plant alive. To conduct this experiment, we were given seeds to water and grow. Throughout the span of about eight and a...
The Evolution of the Size of Human Brain
This is a brain essay in which the following quastion is analysed: how has the size of the brain within this century influenced how Homo Sapiens interpret language, technology and culture? This study explores how the evolution of the larger brain is not important to...
Stress-free Living: Practical Tips and Strategies
To start with, this is expository essay about maintaining a stress free life essay. Here will be discussed how stress affect the health of stomach and what action can be done as a prevention/solution. There are many definitions on what anxiety/stress is, but overall it...
Is It Possible and Ethical to Clone Humans Essay
There are crucial moral arguments against cloning humans, it's been suggested that there might be exceptional cases in which cloning humans might be ethically permissible. In is it possible and ethical to clone humans essay I will try to reveal this topic. One sort of...
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- Genetic Engineering
- Biodiversity
- Photosynthesis
- Natural Selection
- Microbiology
- Cell Membrane
- Animal Cell
- Bioengineering
- Cellular Respiration
- Human Physiology
- Microorganisms
- Gene Mutations
- Scientific Method
- Agriculture
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