- State the importance of each of the following living organisms:
- nutrition (1 mark)
- excretion (1 mark)
- nutrition (1 mark)
- What is meant by the term seed dormancy? (1 mark)
- State three causes of seed dormancy. (3 marks)
- What is meant by the term seed dormancy? (1 mark)
- State two functions of the placenta in mammals. (2 marks)
- The diagram below illustrates a growing pollen tube.
- Name the part labelled B. (1 mark)
- Explain the role of the parts labelled A. (2 marks)
- Name the part labelled B. (1 mark)
- The diagram below shows a set up for an experiment to demonstrate a certan physiological process.
- What nature of solution is represented by 20% sugar solution? (1 mark)
- Explain the observation made on the set up after one hour. (2 marks)
- What nature of solution is represented by 20% sugar solution? (1 mark)
- State three roles of auxins in a plant stem. (3 marks)
- A student drew a 6cm long diagram of a plant flower. If the actual length of the flower was 12cm, calculate the magnification of the drawing made by the student. Show your working. (2 marks)
- Differenciate between phenotype and genotype as used in genetics. (1 marks)
- State two functions of intervertebral discs in the mammalian skeleton. (2 marks)
- Explain two roles of diffusion in human beings. (4 marks)
- What is meant by each of the following terms?
- Crenated cell (1 mark)
- Flaccid cell (1 mark)
- Explain two roles of diffusion in human beings. (4 marks)
- State three differences between tactic and tropic responses. (3 marks)
- The diagram below represents a model used to demonstrate breathing in mammals.
- Name the mammalian structure represented by the parts labelled D and E.
- D ( 1 mark)
- E (1 mark)
- State the observation made when the string is pulled downwards. (1 mark)
- Explain the observation in (b) above. (2 marks)
- Name the mammalian structure represented by the parts labelled D and E.
- State one function of each of the following parts of the mammalian eye:
- eye lashes (1 mark)
- lachrymal glands (1 mark)
- eye lashes (1 mark)
- State three structural differences between DNA and RNA. ( 3 marks)
- Which type of mammalian muscles is voluntary. (1 mark)
- Distnguish between tendon and ligament. (1 mark)
- Which type of mammalian muscles is voluntary. (1 mark)
- The diagram below illustrates a nerve cell.
- Name the type of nerve cell illustrated. (1 mark)
- Give a reason for your answer in (a) above. (1 mark)
- Identify the part labelled J. (1 mark)
- State one function of each of the parts labelled G and H.
- G (1 mark)
- H (1 mark)
- Name the type of nerve cell illustrated. (1 mark)
- Give a reason why the image is not formed when light is focused on the blind spot. (1 mark)
- Explain why
- mammalian testes are located to hang outside the body. (2 marks)
- four months after fertilisation, ovaries can be removed from a huma n female, without terminating pregnancy. (2 marks)
- mammalian testes are located to hang outside the body. (2 marks)
- Why is a burning charcoal stove in a poofy ventilated room likely to cause death of the inhabitants? (3 marks)
- State one function of each of the following cell organelle:
- golgi bodies (1 mark)
- lysosomes (1 mark)
- Name the type of skeleton that amkes up each of the following animals:
- locust (1 mark)
- bird (1 mark)
- locust (1 mark)
- Name two vestigial structures in human beings. (2 marks)
- Why are some bacteria unable to resist the effect of antibiotics? (2 marks)
- Name two vestigial structures in human beings. (2 marks)
- Below is an illustration of a cross section of a plant root showing the transportation of substances in the plant.
- Name the substances transported along the parts labelled K and L.
K (1 mark)
L (1 mark) - Give a reason for your answer in L above. (1 mark)
- Name the substances transported along the parts labelled K and L.
- The diagram below shows the transportation of substances in a human body.
Name the substances represented by
M (1 mark)
N (1 mark)
P (1 mark) - State two roles of luteinising hormone in human reproduction. (2 marks)
- The table provided shows the concentration of sodium and iodine in sea water and cell sap of plant.
- Name the process through which plant cells take up sodium ions. (1 mark)
- Give a reason for your answer in (a) (i) above. (1 mark)
- If the plant was sprayed with with a chemical that inhibits respiration:
- which of the two ions uptake will be affected? (1 mark)
- give a reason for your answer in (b) (i) above. (1 mark)
- The diagram below shows the gaseous exchange system of a locust.
- Name the structure labelled Q. (1 mark)
- State the function of the part labelled R. ( 1 mark)
- How is the part labelled S structurally adapted to its function? (2 marks)
- Name the structure labelled Q. (1 mark)
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