Waec Biology Past Questions and Answers

Question 1976:

• WAEC 2020

(a) Explain briefly the following types of fertilization in animals; (i) external fertilization (ii) internal fertilization
(b) Name two groups of animal each that exhibit the types of fertilization in (a)
(c)(i) If the placenta in a pregnant woman is detached from the uterine wall, give three effect this will have on the foetus
(ii) Name three other features in the uterus of a pregnant woman that are useful for the development of the foetus
(d) Explain briefly how the activities of organisms bring bout dynamic equilibrium in the habitat.
(e) State four problems that organisms in the intertidal zone of a marine habitat could encounter.
(f) Explain briefly the reasons that the following factors are necessary for germination; (i) moisture (ii) viable seeds
(g) Explain briefly the reason light energy is considered a limiting factor in the production of foods by autotrophs.

Question 1977:

• WAEC 2020

Which of the following statements best explains the reason why termites swarm at night?

A. Light is not necessary for swarming
B. They avoid day-flying birds
C. Light destroys their wings
D. They can only see in the dark

Question 1978:

• WAEC 2020

Who proposed the theory of evolution by natural selection

A. Darwin
B. Lamark
C. Aristotle
D. Linnaeus

Question 1979:

• WAEC 2020

Replication of DNA molecules is catalysed by an enzyme called

A. Polymerase
B. Ptyalin
C. Pepsin
D. Amylase

Question 1980:

• WAEC 2020

The diagram below is an illustrating of a cross between plants ! and B of the same species. Study it to answer the question below;


The process that gave rise to the F1 generation is

A. Self fertilization
B. Cross fertilization
C. Out-breeding
D. Test cross