WAEC Biology Past Questions & Answers - Page 50

246.

The illustration above represents a cross between a colour blind male and normal female.
Study it carefully and answer the questions.

What is the genotype ratio of carrier females to normal males in the cross?

A.

1:1

B.

2:3

C.

3:4

D.

4:1

Correct answer is A

No explanation has been provided for this answer.

247.

Use the diagram above that shows the effect of nitrates on water bodies Study it carefully and answer questions.

Another cause that could lead to the phenomenon in the diagram is

A.

exhaust from cars

B.

oil spillage

C.

dumping of sewage

D.

excess rainfall

Correct answer is C

No explanation has been provided for this answer.

248.

Use the diagram above that shows the effect of nitrates on water bodies Study it carefully and answer questions.

The phenomenon in the diagram is termed

A.

denitrification

B.

conservation

C.

eutrophication

D.

global warming

Correct answer is C

Eutrophication is the process by which a body of water becomes enriched in dissolved nutrients (such as nitrates in this case) that stimulate the growth of aquatic plant life usually resulting in the depletion of dissolved oxygen.

249.

Use the diagram above that shows the effect of nitrates on water bodies Study it carefully and answer questions.

The source of the nitrates in the diagram is termed

A.

root nodules of legumes

B.

cloud

C.

fertilizers

D.

organic matter

Correct answer is C

No explanation has been provided for this answer.

250.

The inability of an organism to adapt to its habitat can lead to

A.

dormancy

B.

adaptation

C.

extinction

D.

survival

Correct answer is C

No explanation has been provided for this answer.