Post Utme Obafemi Awolowo University Biology Past Questions and Answers

Question 21:

Osmosis can be defined as diffusion of ____________

A. Water molecules from an area of high concentration to an area of low concentration
B. Water molecules from a dilute solution to a concentrated solution across a permeable membrane
C. Water molecules from a concentrated solution to a dilute solution through a semi-permeable membrane
D. Water molecules from a dilute solution to a concentrated solution through a semi-permeable membrane

Question 22:

The oxygen given off during the process in the above equation is derived from ____________

A. Sunlight
B. Water
C. Carbon dioxide
D. Atmosphere

Question 23:

When testing a leaf for starch, why is it first placed in boiling water?

A. To extract the chlorophyll
B. To remove colour from the leaf
C. To dissolve the starch
D. To stop chemical reactions

Question 24:

Each of the following is an arthropod except the ____________

A. Crab
B. Scorpion
C. Spider
D. Snail

Question 25:

The largest phylum in the animal kingdom is ____________

A. Cnidaria
B. Mollusea
C. Chordata
D. Arthropoda