The diagram below represents a plant tissue
- Name the structures L and O. (2 marks)
L
O
- State the function of structure N and cell labelled M. (2marks)
- Give two structural differences between phloem tissue and xylem tissue. (2marks)
- Distinguish between active and passive immunity. (2marks)
- he following figures represent the forelimb of a certain animal species. Study them and answer the questions that follow
- Name the bones labelled E and G. (2marks)
- State the type of skeleton represented by figure 1. (1mark)
- Name the type of joint at point Q. (1mark)
- Which two figures represent analogous structures? (1mark)
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- Give adaptational differences between structures in figure 1 and 3. (3 marks)
- Colour blindness is a disorder caused by gene mutation and it is controlled by a recessive gene. A man with normal colour vision marries a carrier woman:
- Using letter B to represent the gene for normal color vision, what is the chance that their son will be colour blind? Show your working. (4marks)
- Name another trait in humans inherited in the same way as colour blindness. (1mark)
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- Briefly describe inversion in gene mutation. (1mark)
- Distinguish between back cross and testcross. (2marks)
- a) Nitrogen in the atmosphere cannot be directly utilized by plants. State two ways by which this nitrogen is made available for plant use. (2marks)
- State the importance of saprophytic bacteria in the environment. (1mark)
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- Briefly explain the how excessive use of fertilizers affects the large water bodies. (3marks)
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- Explain how competition regulates the animal population in a habitat. (2marks)
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- The figure below shows the parts of the human digestive system. Study it and answer the questions that follow.
- Name the organs labelled A, B and D. (3marks)
A………………………………………………………………………………………………………………
B………………………………………………………………………………………………………………
D………………………………………………………………………………………………………………
- State the role of part labelled C. (1mark)
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- Name the two salivary glands in human beings. (2marks)
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- Give two adaptations of part labelled D to its function. (2marks)
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- An experiment was carried out to investigate transpiration and absorption of water in sunflower plants in their natural environment with adequate supply of water. The amount of water was determined in a two hour intervals. The results are as shown in the table below.
| TIME OF THE DAY | AMOUNT OF WATER IN GRAMMES | |
| Transpiration | Absorption | |
| 11:00-13:00 | 33 | 20 |
| 13:00-15:00 | 45 | 30 |
| 15:00-17:00 | 52 | 42 |
| 17:00-19:00 | 46 | 46 |
| 19:00-21:00 | 25 | 32 |
| 21:00-23:00 | 16 | 20 |
| 23:00-01:00 | 8 | 15 |
| 01:00-03:00 | 4 | 11 |
Using the same axes, plot graphs to show transpiration and absorption of water in grammes against time of the day.
