WAEC Biology Past Questions & Answers - Page 125

621.

The break-down of food in a simple, soluble and absorbable end-products is termed

A.

absorption

B.

ingestion

C.

nutrition

D.

digestion

Correct answer is D

No explanation has been provided for this answer.

622.

An organism is considered a heterotroph when it

A.

feeds on inorganic food

B.

feeds on already manufactured food

C.

fixes atmospheric nitrogen

D.

respires anaerobically

Correct answer is B

No explanation has been provided for this answer.

623.

The deficiency of vitamin D and calcium ions in the diet of a human causes

A.

anaemia

B.

night-blindness

C.

kwashiokor

D.

rickets

Correct answer is D

No explanation has been provided for this answer.

624.

Which of the following is not true about a potted plant left in the laboratory for one week without watering?

A.

the cells of the plant will be turgid

B.

there will be wilting of the plant

C.

the leaves are likely to turn yellow

D.

plant will not take in enough nutrients

Correct answer is A

No explanation has been provided for this answer.

625.

The deficiency of manganese in plants results in?

A.

death of shoot

B.

leaves turning yellow

C.

stunted growth

D.

poor root development

Correct answer is B

Manganese deficiency can be easy to spot in plants because, much like Magnesium deficiency (agriculture), the leaves start to turn yellow and undergo interveinal chlorosis. The difference between these two is that the younger leaves near the top of the plant show symptoms first because manganese is not mobile while in magnesium deficiency show symptoms in older leaves near the bottom of the plant.