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Biology 2021 WAEC Past Questions

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21

Which of the following organisms does not undergo incomplete metamorphosis?

  • A. locust
  • B. grasshopper
  • C. butterfly
  • D. cockroach
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22

An enzyme reaction may begin to decline when?

  • A. the optimum temperature is attained
  • B. the ph of the medium is altered
  • C. there is an increase in substrate concentration
  • D. the atmospheric pressure is altered
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23

The diagram above is an illustration of the growth of a plant in a water culture. After a few days, the solution turned green and the plant died. Use this to answer this question.

What precaution should have been taken to prevent the solution from turning green?

  • A. use a non-green plant for the experiment
  • B. aerate the solution daily
  • C. cover the culture vessel with opaque paper
  • D. keep cotton wool around the seedling to make it dry
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24

The diagram above is an illustration of the growth of a plant in a water culture. After a few days, the solution turned green and the plant died. Use this to answer this question.

The death of the plant was likely caused by?

  • A. excess supply of nutrients to the plant
  • B. inadequate supply of water to the plant
  • C. algal growth in the solution that used up the nutrients
  • D. inability of the plant to make food due to lack of sunlight
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25

Which of the following factors is not necessary for photosynthesis?

  • A. water
  • B. carbon (IV) oxide
  • C. wind
  • D. sunlight
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