Jamb Biology Past Questions For Year 1992
Question 11
The flow of air and water in or out of the mesophyll layer of a leaf is controlled by the
- A. stomata
- B. lenticels
- C. air space
- D. guard cell
Question 12
An onion is a bulb because it
- A. has a tuberous stem
- B. has a reduced stem and thick fleshy leaves
- C. has adventitous roots
- D. bears many buds at the nodes
Question 13
Which of the following insects undergoes incomplete metamorphosis?
- A. Mosquito
- B. Termite
- C. Housefly
- D. Moth
Question 14
The excretory organ in insects is the
- A. kidney
- B. malpighian tubule
- C. flame cell
- D. nephridium
Question 15
In the absence of oxygen, the pyruvic acid produced during glycolysis is converted to CO2 and
- A. water
- B. glycerol
- C. ethanol
- D. citric acid
