Jamb Biology 1990 Past Questions and Answers

Question 36:

• JAMB 1990

Haemophilia results from the mutation of the genes

A. In the sex chromosome
B. Which control skin colour
C. Which control the mechanism for blood-clotting
D. Which control the formation of haemoglobin

Question 37:

• JAMB 1990

In a savanna ecosystem the abiotic factors include

A. Legumes, temperature and sandy soil
B. Water, temperature and soil
C. Minerals, oxygen and reptiles
D. Water, soil and grasses

Question 38:

• JAMB 1990

Which of the following is an omnivore?

A. Praying mantis
B. Hawk
C. Mouse
D. Grasshopper

Question 39:

• JAMB 1990

which of the organisms will have the lowest population in an ecosystem?

A. Hawk
B. Cowpea
C. Praying mantis
D. Mouse

Question 40:

• JAMB 1990

The salinity of a brackish enviroment

A. Increases immediately after rain
B. Increase at the end of rainy season
C. Decrease with increase in micro-organisms
D. Increase during dry season