WAEC Biology Past Questions & Answers - Page 95

471.

Study the following list of deficiency symptoms in animals. Use it to answer the question below
I. Loss of appetite and weight; II. Delayed wound healing; III. Rickets; IV Sterility in animals
V Failed blood clotting; VI. Night blindness

Which of the following deficiencies is caused by a lack of vitamin A

A.

I

B.

III

C.

V

D.

VI

Correct answer is D

No explanation has been provided for this answer.

472.

Which of the following solutions will induce the condition shown in the diagram? 

A.

Hypertonic solution

B.

Hypotonic solution

C.

isotonic solution

D.

Distilled water

Correct answer is B

No explanation has been provided for this answer.

473.

The condition shown in the above diagram is due to

A.

conversion of starch to sugar

B.

conversion of sugar to starch

C.

excess water in structure labelled I

D.

presence of carbondioxide in the structure labelled I

Correct answer is C

No explanation has been provided for this answer.

474.

Which of the labelled structures in the diagram will shrink when plasmolysis occurs?

A.

I

B.

II

C.

III

D.

IV

Correct answer is A

No explanation has been provided for this answer.

475.

Which of the labelled structures in the diagram are involved with the entry of carbondioxide for photosynthesis?

A.

I, II and III only

B.

I, II, III and VI

C.

I, II, V and VI

D.

I, II, III, and IV

Correct answer is B

No explanation has been provided for this answer.