WAEC Past Questions and Answers - Page 4143

20,711.

An image which cannot be formed on a screen is said to be

A.

inverted

B.

real

C.

virtual

D.

erect

E.

blurred

Correct answer is C

No explanation has been provided for this answer.

20,712.

Longitudinal waves cannot be

A.

diffracted

B.

retracted

C.

polarized

D.

reflected

E.

superposed

Correct answer is C

No explanation has been provided for this answer.

20,714.

One of the major criticisms against Mendelian laws is that they do not recognize that

A.

one trait is often controlled by many pairs of genes

B.

single factor inheritance is never a reality

C.

complete dominance is always possible

D.

incomplete dominance is not possible

E.

hybrids exist in living organisms

Correct answer is A

No explanation has been provided for this answer.

20,715.

One of the factors that must be considered for safe blood transfusion is the

A.

social class of the donor

B.

age of the recipient

C.

rhesus factors of the donor and the recipient

D.

nationality of the donor

E.

weight of the recipient

Correct answer is C

No explanation has been provided for this answer.