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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)
  •  Give two structural differences between phloem tissue and xylem tissue.                                 (2marks)
  •  Distinguish between active and passive immunity.                                                                     (2marks)
  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)
  •  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)
  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.                         

Biology KCSE Prediction Questions