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Biology 2009 WAEC Past Questions

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26
The mesophyll layer of a leaf consists of
  • A. wax and cutin
  • B. cells with lignified walls
  • C. irregularly shaped collenchyma cells.
  • D. photosynthetic parenchyma cells.
View Answer & Discuss WAEC 2009
27
Which of the following treatments would increase the rate of transpiration in a potted plant?
  • A. Placing it in a cold room
  • B. Placing it under a fan in a room
  • C. Putting it in a cupboard
  • D. Smearing grease on the lower surface of the leaves
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28

Pepsin is secreted as an inactive precursor called pepsinogen because

  • A. pepsin as an enzyme is quickly destroyed by the alkaline food from the mouth
  • B. all digestive enzymes pass through a precursor stage
  • C. pepsin is a proteolytic enzyme and might attack the stomach tissues
  • D. pepsin is not required in large quantities
View Answer & Discuss (3) WAEC 2009
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29
An organism whose source of carbon is inorganic is likely to be a/an
  • A. heterotrophic organism
  • B. autotrophic organism
  • C. symbiotic organism
  • D. parasitic organism
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30
Which of the following organisms is an endoparasite?
  • A. Mice
  • B. Mosquito
  • C. Ascaris
  • D. Dodder
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