JAMB Biology Past Questions & Answers - Page 268

I. High birth rate and high immigration rate
II. Low birth rate and high immigration rate
III. 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?

Atmospheric nitrogen is converted to soil nitrogen for plant use by

An ecological succession often leads to

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?

Serum differs from blood plasma because