INSTRUCTIONS TO CANDIDATES.
- This paper consist of TWO section A and B
- Answer ALL the questions in section A in the spaces provided
- In section B answer question 6 (compulsory) and either question 7 or 8 in the spaces provided after question 8.
For examiners use only:
SECTION |
QUESTION |
MAX.SCORE |
CANDIDATES SCORE |
A |
1 2 3 4 5 |
8 8 8 8 8 |
|
B |
6 7 8 |
20 20 20 |
|
TOTAL |
80 |
|
QUESTIONS
SECTION A (4OMKS)
Answer ALL the questions in this section in the spaces provided.
- The diagram below represents a food web in a terrestrial ecosystem.
- Which organism has the highest number of preys (l mk)
- Construct food chains with snakes as tertiary consumers (2mks)
- State the trophic level occupied by hawks in the food chains constructed in b) above (lmk)
- Describe how capture-recapture method can be used in estimating the population of fishes in a lake. (4mks)
- Study the diagram below and answer the questions that follow.
- Name the part labeled A and B (2marks)
- State the function of the part labeled C (2marks)
- How is the part labeled E adapted to its function (2marks)
- Identify the structure that perform the same function as one illustrated above in (2marks)
- Amoeba
- Fish
-
- What is multiple allelism? (1mk)
- A pure breeding black male mouse was mated with a pure breeding brown female mouse.
All the offspring had black coat colour.
Explain the appearance of black coat colour in the offspring. (1mk)- If the black parental mouse was mated with a mouse that is heterozygous for coat colour, work out the genotypic ratio of the offspring. Show your working. (4mks)
- State two disorders in human beings that are as a result of chromosomal mutation. (2mks)
-
- Explain what happens to excess amino acids in the liver of humans (3mks)
- Name two parts of human nephron which are only found in the kidney cortex. (2mks)
-
- In what form is carbon(ii) oxide transported in blood. (1mk)
- Explain why it may cause death (2mks)
- The diagram below indicates an organism that grows under shaded places with damp conditions. Study it and answer the questions that follow.
- Name the division to which the specimen belongs. (1 mark)
- Name and state the functions of the parts labelled Q, R and S. (6 marks)
- Name the two body forms of the organism in its alternation of generation. (1 marks)
SECTION B (40 MARKS)
Answer question 6 compulsory and either 7 or 8 in the spaces after question 8.
- The following data results of making daily growth measurement on an organism over a period of 24 days during its development.
DAY
WIDTH OF HEAD (MM)
LENGTH OF
FEMUR 1MM
HIND
1
3.0
7.0
2
3.5
7.5
3
4.0
8.0
4
4.0
8.0
5
4.0
8.0
6
4.0
8.0
7
4.0
8.0
8
4.4
9.2
9
4.7
10.5
10
5.0
12.0
11
5.0
12.0
12
5.0
12.0
13
5.0
12.0
14
5.0
12.0
15
5.0
12.0
16
5.0
12.0
17
5.6
13.3
18
6.4
14.8
19
7.0
16.4
20
7.6
18.0
21
7.6
18.0
22
7.6
18.0
23
7.6
18.0
24
7.6
18.0
- Using a suitable scale, draw graphs of width of head and length of femur against time. Draw the graphs on the same axis. (8 marks)
-
- Name the growth pattern represented by the graphs. (1 mark)
- With reference to your graph, identify the phylum to which the organism belongs. Give a reason for your answer. (2marks).
-
- Account for the length of hind limb (femur) between day 3 and day 7. (3 marks)
- Day 7 and day 10. (2 marks)
- State the hormones involved in the growth pattern represented by the graphs. (2 marks)
- State two advantages for metamorphosis in organisms. (2 marks)
-
- Describe the structural adaptations of mammalian heart to its functions (10mks).
- Explain the role of osmosis in organisms (10mks)
- Describe the movement of water from the soil up to the leaves and then into the atmosphere. (20 marks)
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