Waec Biology 2009 Past Questions and Answers

Question 26:

• WAEC 2009

Which of the following cycles involves the process of precipitation and transpiration?

A. Water cycle
B. Carbon cycle
C. Nitrogen cycle
D. Oxygen cycle

Question 27:

• WAEC 2009

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.

Question 28:

• WAEC 2009

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

Question 29:

• WAEC 2009

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

Question 30:

• WAEC 2009

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