Biology
Paper 2
(Theory)
Instructions to Candidates
- Answer ALL the questions in section A in the spaces provided below each question in the question paper
- In section B, answer question 6(Compulsory) and either question 7 or 8
Questions
SECTION A
- The diagram below shows the traverse section of a young stem.
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- Name the class of the plant from which the section was obtained belong. ( 1 mark)
- Give a reason for your answer in (a)(i) above (1 mark)
- What are the functions of the structures labelled A, B and E (3 marks)
- What type of cells are fond in the parts labelled D (1 mark)
- Name the tissue labelled C (1 mark)
- How is the part labelled C adapted to its functions? ( 1 mark)
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- What is meant by the term non-disjunction (1marks)
- Differentiate between continuous and discontinues variations, giving examples of each (2 marks)
- A female with sickle cell trait marries a normal man. The allele for sickle cell is HbS and the normal allele is HbA. Using a Punnet square, determine the probability that their first born will have sickle cell trait. Show your working. (5 marks)
- The diagram below shows some of the processes that take place in the female reproductivesystem.
- Name the part process labeled I and state the hormone responsible for triggering the process. (2 marks)
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- Name the structures labeled R; (1 mark)
- Identify the hormone responsible for the formation of the structures named in b (i) above; (1 marks)
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- Identify the process labeled II (1 mark)
- Explain what leads to the process named in d(i) above. (3 marks)
- Study the diagram below which makes 4 revolutions per hour. A tomato seedling with a straight radicle and plumule was attached to the apparatus as shown below.
- Give the name of the above apparatus (1mk)
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- Make a drawing of how the seedling above might have appeared after a fortnight.
(Draw the seedling alone with radicle and shoot) (2mks) - Account for the observation in b) (i) above (2 marks)
- Make a drawing of how the seedling above might have appeared after a fortnight.
- What type of responses are being expected in this experiment? (2 marks)
- Give one survival value of the response above (1 mark)
- The diagram below represents a food web in a terrestrial ecosystem.
- Which organism has the highest number of preys (lmk)
- Construct food chains with snakes as tertiary consumers (2mks)
- State the trophic level occupied by hawks in the food chains constructed in b) above (1 mark)
- Describe how capture — recapture method that can be used in estimating the population of fishes in a lake. (4mks)
SECTION B
- The length of a grasshopper femur and internode of a seedling were recorded in a period of 19 weeks. The results are recorded in the table below.
Week 1 3 5 7 9 11 13 15 17 19 Average length of femur(mm) 8.0 9.0 9.0 9.0 13.0 13.0 15.0 19.0 19.0 19.0 Average length of internode(mm) 5.0 6.5 10.5 16.5 24.5 27.5 32.5 34.5 36.0 37.5 - Plot a graph of length of femur and internode against time on the same (7mk)
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- What was the average length of internode in the 8th week? (1mk)
- Suggest how average length of internodes was obtained. (2mk)
- Name the type of growth curve shown by:
- Grasshopper (1mk)
- Seedling (1mk)
- Account for the change in length for femur between:
- 3rd and 7th week. (2mk)
- 16th and 20th week. (2mk)
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- Which animal phylum exhibits the growth pattern of the femur? (1mk)
- Name the hormone responsible for the growth pattern in grasshopper.(1mk)
- Work out the rate of growth of the seedling between week 7 and 10. (2mk)
- Describe the adaptation of the mammalian eye to its functions (20 marks)
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- Define the term natural selection (1 mark)
- Explain how the distribution of the two types of moths were used as evidence of natural selection in action (5 marks)
- Describe evidences to support organic evolution (14 marks)
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