Jamb Biology 2000 Past Questions and Answers

Question 26:

• JAMB 2000

In an experiment to estimate the volume of air in a soil sample using a measuring cylinder, it was found that:
initial volume of water .... = p cm₃
volume of soil before mixing with water = q cm₃
Final volume of water after adding soil = r cm₃
From the data above, which of the following deductions is correct?

A. R = p + q
B. R > p + q
C. Q = r - p
D. R < p + q

Question 27:

• JAMB 2000

An ecological succcession often leads to

A. An increase in species diversity
B. Decrease in species diversity
C. An unstable community
D. The dispersal of species

Question 28:

• JAMB 2000

Atmospheric nitrogen is converted to soil nitrogen for plant use by

A. Nitrification and combustion
B. Putrefaction and lightning
C. Lightning and nitrification
D. Combustion and putrefaction

Question 29:

• JAMB 2000

I. High birth rate and high immigration rate II. Low birth rate and high immigration rate II. Low mortality rate and low emigration IV. High mortality rate and high emigration rate. Which combination of the above can cause rapid over-crowding in climax biotic communities and human settlements?

A. II and III
B. I and III
C. I and IV
D. I and II

Question 30:

• JAMB 2000

The soil becomes toxic to plants when the concentration of its essential elements is in the range labelled

A. IV
B. III
C. II
D. I