Jamb Biology 1991 Past Questions and Answers

Question 36:

• JAMB 1991

When two heterozygotes mate, the dominant trait will appear in

A. The F₁ generation only
B. The F₂ generation only
C. Both the F₁ and F₂ generations
D. Neither the F₁ nor F₂ generation

Question 37:

• JAMB 1991

Which of the following characters is NOT sex-linked?

A. River blindness
B. Baldness
C. Haemophilia
D. Colour blindness

Question 38:

• JAMB 1991

The most important factors which influence an organism's way of life in its habitat are

A. The physicals and biotic enviroment
B. Food and water availability
C. Temperature, water, light and predator-prey relationship
D. Competition for food and spaces

Question 39:

• JAMB 1991

Organisms in an ecosystem are usually grouped according to their trophic level as

A. Carnivores and epiphytes
B. Consumers and parasites
C. Producers and consumers
D. Producers and saprophytes

Question 40:

• JAMB 1991

The above diagram represents a competitive interaction between organism in communities I and II. Which of the following statements is CORRECT?

A. The population of I was higher than II at the beginning of the experiments
B. II was wiped out from the enviroment at the end of the experiments
C. The population of II was always lower than that of
D. The population of I was lower at the end of the experiment than at the beginning