Biology 2020 Waec Past Questions and Answers

Question 26 :

• 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 27 :

• 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 28 :

• 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 29 :

• 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

Question 30 :

• 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

The number of lions and antelops in habitat Y shows that the lion

A. Is the prey while the antelope is the predator
B. Is the predator while the antelope is the prey
C. And the antelope are preys to each other
D. And the antelopes are predators