Waec Biology Past Questions and Answers

Question 1996:

• WAEC 2020

The depletion of the ozone layer will result in the earth surface receiving more

A. Gamma rays
B. Infra-red rays
C. Ultraviolet rays
D. X-rays

Question 1997:

• WAEC 2020

Which of the following statements about a mixture of a protein-digesting enzyme and starch solution would be correct?

The protein-digesting enzyme

A. Has no effect on the starch solution
B. Leads to the production of amino acids
C. Leads to the production of glucose
D. Digest the starch

Question 1998:

• WAEC 2020

The mutualism type of relationship is different from a parasitic relationship because in mutualism

A. Both organisms involved benefit
B. None of the organisms benefits or harm each other
C. Both organisms harm each other
D. Only one of the organisms is harmed

Question 1999:

• WAEC 2020

The table below shows the number of some organisms in habitats W and Y. Study it to answer the question below;
Number in the habitat

Organism
	habitat W	habitat Y
Plankton	126	0
Antelope	0	51
Water flea	10	0
Tilapia	23	0
Lion	0	6
Frog	6	0
Grass	0	250

What type of habitat is W?


A. Rainforest
B. Pond
C. Desert
D. Ocean

Question 2000:

• WAEC 2020

The table below shows the number of some organisms in habitats W and Y. Study it to answer the question below;
Number in the habitat

Organism
	habitat W	habitat Y
Plankton	126	0
Antelope	0	51
Water flea	10	0
Tilapia	23	0
Lion	0	6
Frog	6	0
Grass	0	250

Which of the following statements about habitat W is correct? The

A. Absence of lions and antelopes shows that the habitat is terrestrial
B. Presence of Tilapia and planktons shows that the habitat is not aquatic
C. Type of organisms present indicate that habitat is aquatic
D. Absence of grasses indicates that the habitat is terrestrial