Biology Past Questions and Answers

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

The number of plant species obtained from a population study of a garden is as follows: <i>Guinea grass</i> (15), <i>Ipomoea spp</i> (5), <i>Sida spp</i> (7) and <i>Imperata spp</i> (23)<br/><br/>What is the percentage of occurrence of <i>Imperata spp?</i>

When a marine fish was taken from the ocean and put in a tank of fresh water, it died after a short period because?

If a DNA strand has a base sequence TCA, its complementary strand must be?

The appendicular skeleton is composed of the pectoral girdle?