WAEC Biology Past Questions & Answers - Page 125

621.

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.

622.

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.

623.

A solution which contains all the required elements in their correct proportions is known as a

A.

culture nutrient

B.

growth medium

C.

complete culture solution

D.

nutrient solution

Correct answer is C

No explanation has been provided for this answer.

624.

Which of the following groups contains only macro-nutrients?

A.

phosphorus, nitrogen and molybdenum

B.

manganese, copper and zinc

C.

boron, sulphur and iron

D.

calcium, magnesium and potassium

Correct answer is D

No explanation has been provided for this answer.

625.

The process by which fruits develop without fertilization is called

A.

parthenocarpy

B.

pathology

C.

hermaphroditism

D.

layering

Correct answer is A

No explanation has been provided for this answer.