The diagram below represents a plant tissue

  1. Name the structures L and O.                                                                                                      (2 marks)

L…………………………………………………………………………………………………………..

O………………………………………………………………………………………………………………..

  •  State the function of structure N and cell labelled M.                                                                             (2marks)

N…………………………………………………………………………………………………………

M………………………………………………………………………………………………………….

  •  Give two structural differences between phloem tissue and xylem tissue.                                 (2marks)

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  •  Distinguish between active and passive immunity.                                                                     (2marks)

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  1. he following figures represent the forelimb of a certain animal species. Study them and answer the questions that follow
  1. Name the bones labelled E and G.                                                                                                (2marks)

E………………………………………………………………………………………………………………..

G……………………………………………………………………………………………………………………

  •  State the type of skeleton represented by figure 1.                                                                        (1mark)

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  •  Name the type of joint at point Q.                                                                                                 (1mark)

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  • Which two figures represent analogous structures?                                                                       (1mark)

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  •  Give adaptational differences between structures in figure 1 and 3.                                        (3 marks)

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  • 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)

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  • Distinguish between back cross and testcross.                                                                             (2marks)

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  •  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)

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  1.  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.
  1.  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 DAYAMOUNT OF WATER IN GRAMMES
 TranspirationAbsorption
11:00-13:003320
13:00-15:004530
15:00-17:005242
17:00-19:004646
19:00-21:002532
21:00-23:001620
23:00-01:00815
01:00-03:00411

 Using the same axes, plot graphs to show transpiration and absorption of water in grammes against time of the day.                         

Answers to Biology Studies KCSE Prediction Questions

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