Jamb Biology 1987 Past Questions and Answers

Question 36:

• JAMB 1987

The center for controlling body temperature in the brains is the

A. Cerebrum
B. Cerebellum
C. Medulla
D. Hypothalamus

Question 37:

• JAMB 1987

Unlike auxins, gibberellins

A. Induces the formation of adventitious roots
B. Do not affect leaf and fruit abscission
C. Cannot stimulate stem elongation
D. Are quite effective as herbicides

Question 38:

• JAMB 1987

A gene which expresses itself only in the homozygous condition is

A. A mutant
B. Dominant
C. Recessive
D. Lethal

Question 39:

• JAMB 1987

An example of monohybride inheritance in man is

A. Astigmatism
B. Cretinism
C. Hyperthyroidism
D. Albinism

Question 40:

• JAMB 1987

If a plant homozygous for round and yellow (RR : YY), is crossed with a wrinkle green type (rr : yy) all of the resulting seeds will be

A. Blue and wrinkled
B. Round and yellow
C. Wrinkled and yellow
D. Round and greenish yellow