Question 481:

• JAMB 1986

If a woman who is a carrier of sickle cell trait (AS) married a man who is a sickler (SS) and they had four children, how many of them would be normal?

A. Three
B. Two
C. One
D. None

Question 482:

• JAMB 1986

Which of the following is an example of discontinuous variation?

A. Skin colouration
B. Left handedness
C. Body weight
D. Height

Question 483:

• JAMB 1986

The hormones which regulates the amount of glucose in the blood is called

A. Adrenalin
B. Auxin
C. Insulin
D. Thyroxine

Question 484:

• JAMB 1986

An instrument that can be used to demonstrate phototropism and geotropism in plants is the

A. Auxanometer
B. Potometer
C. Klinostat
D. Photometer

Question 485:

• JAMB 1986

In an ecosystem, animals which feed directly on plants are called

A. Secondary consumers
B. Primary consumers
C. Producers
D. Predators