Biology Past Questions and Answers

(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.

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

Who proposed the theory of evolution by natural selection

Replication of DNA molecules is catalysed by an enzyme called

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