Waec Biology Past Questions and Answers

Question 1971:

• WAEC 2019

a. Complete the table below.

Organism	Mode of feeding	Feature of mouthpart that adapts organism to mode of feeding

[6 marks]

b. List five parts of the alimentary canal of an earthworm. [5 marks]

c. State six ways by which water could be polluted by agricultural practices. [6 marks]

d. Describe briefly the life cycle of a housefly. [5 marks]

e. Make a diagram, 6 cm – 8 cm long of the hypogeal germination in a mature maize seedling and label fully. [8 marks]

Question 1972:

• WAEC 2020

(a) Explain briefly how the human ear carries out its function of balancing.
(b) (i) make a drawing 8 cm - 10 cm long of the structure of the human ear and label fully.
(ii) Describe briefly the structure of the middle ear in humans.

Question 1973:

• WAEC 2020

(a)(i) What is a deficiency disease?
(ii) Complete the table below by naming five nutrient deficiency diseases in humans and stating one remedy for each of the diseases.
(b) Outline a chemical test for (i) Starch in a tuber of yam (ii) Glucose in orange fruit

Nutrient deficiency disease	Remedy

Question 1974:

• WAEC 2020

(a) Complete the table below;

Disease	Causative organism	Vector	Control
Cholera
	Trypanosome
		Female Anopheles mosquito
Ringworm		None

(b) Explain briefly the biological basis of preserving foods using each of the following methods;
(i) salting (ii) irradiation (iii) smoking

Question 1975:

• WAEC 2020

(a) Explain briefly; (i) independent assortment of genes (ii) the reason blood group O in humans can only exist in homozygous form while blood groups A and B can exist both in homozygous and heterozygous forms.
(b) Complete the table below by naming the classes of vertebrates in their evolutionary trend and giving one example each of the classes.

Classes of vertebrate	One example