WAEC Past Questions and Answers - Page 3926

19,626.

The probabilities that Kodjo and Adoga pass an examination are \(\frac{3}{4}\) and \(\frac{3}{5}\) respectively. Find the probability of both boys failing the examination

A.

\(\frac{1}{10}\)

B.

\(\frac{3}{10}\)

C.

\(\frac{9}{20}\)

D.

\(\frac{2}{3}\)

Correct answer is A

P(Kodjo passing) = \(\frac{3}{4}\); P(Adoga passing) = \(\frac{3}{5}\)

P(Kodjo failing) = \(\frac{1}{4}\); P(Adoga failing) = \(\frac{2}{5}\)

P(both fail) = \(\frac{1}{4} \times \frac{2}{5}\)

= \(\frac{1}{10}\)

19,627.

Which of the following factors may not affect living organisms in an aquatic habitat?

A.

Turbidity

B.

Temperature

C.

Humidity

D.

Light

Correct answer is C

No explanation has been provided for this answer.

19,628.

A situation whereby some mammals remain inactive throughout dry and hot seasons is known as 

A.

aestivation

B.

dormancy

C.

burrowing

D.

incubation

Correct answer is A

No explanation has been provided for this answer.

19,629.

Which of the following is a means of measuring primary production?

A.

Rate of reproduction of animals

B.

Life span of an organism

C.

Number of predators in an environment

D.

harvested plants in a unit area

Correct answer is D

No explanation has been provided for this answer.

19,630.

Carbon is added to the atmosphere by the following processes except

A.

respiration

B.

burning

C.

photosynthesis

D.

volcanic eruption

Correct answer is C

No explanation has been provided for this answer.