Jamb Biology 1991 Past Questions and Answers

Question 21:

• JAMB 1991

Which of the following can bring about the greatest increase in the rate of transpiration?

A. Increased humidity
B. Reduced temperature
C. Reduced wind speed
D. Reduced humidity

Question 22:

• JAMB 1991

After 30 minutes, the level of sugar solution in the above figure will

A. Rise in x only
B. Rise in Y only
C. Be the same in X and Y
D. Fall in Y

Question 23:

• JAMB 1991

The process by which water moves from X to Y through the semi-permeable membrane is called

A. Diffusion
B. Osmosis
C. Active diffusion
D. Osmoregulation

Question 24:

• JAMB 1991

Fibrinogen and prothrombin play important roles in the

A. Deamination of proteins
B. Clotting of blood
C. Detoxication of substance
D. Storage of vitamins

Question 25:

• JAMB 1991

Deoxygenation blood flows into the right and left lungs through the

A. Pulmonary vein
B. Vena cava
C. Pulmonary artery
D. Subclavian vein