WAEC Biology Past Questions & Answers - Page 117

581.

The following substances pass into the blood of the foetus from the mother's blood via the placenta except

A.

carbon dioxide

B.

glucose

C.

viruses

D.

antibodies

Correct answer is C

No explanation has been provided for this answer.

582.

The inability of a human to maintain proper balance may be due to a defect in the

A.

cochlea

B.

Eustachian tube

C.

Semi-circular canals

D.

oval window

Correct answer is C

No explanation has been provided for this answer.

583.

Which of the following conditions in flowering plants enhance self-pollination?

A.

Cleistogamy

B.

Heterostyly

C.

Protandry

D.

Protogyny

Correct answer is A

No explanation has been provided for this answer.

584.

The legs of an accident victim with a fractured vertebral column and injured spinal cord could not be raised because

A.

impulses from receptors in the legs cannot travel to the brain

B.

impulses from the brain cannot travel to the legs

C.

chemical substances will be released at synapses in the central nervous system

D.

reflex actions cannot take place in the legs

Correct answer is A

No explanation has been provided for this answer.

585.

Which of the following processes is not a function of the mammalian skin?

A.

Body temperature regulation

B.

Reception of external stimuli

C.

Excretion

D.

Gaseous exchange

Correct answer is D

No explanation has been provided for this answer.