Waec Biology Past Questions and Answers

Question 1901:

• WAEC 1996

Which of the following statements is not true about chromosomes?

A. Each chromosome is made up of two chromatids
B. Body cells have diploid numbers of chromosomes
C. Homologous chromosomes do not occur in pairs naturally
D. The sex cells have haploid number of chromosomes
E. Chromosomes have many tranverse bands

Question 1902:

• WAEC 1996

Cross-breeding is a way of

A. Developing superior varieties of plants only
B. Developing superior varieties of animals only
C. Developing disease-resistant varieties only
D. Encouraging random reproduction in agriculture
E. Applying the principles of heredity in agriculture

Question 1903:

• WAEC 1996

The wings of bats and birds, the flippers of whale and the fins of fish are examples of

A. Adaptive radiation
B. Vestigial organs
C. Continuous variation
D. Convergent evolution
E. Divergent evolution.

Question 1904:

• WAEC 1996

Which of the following is a social insect?

A. Mosquito
B. Butterfly
C. Honey bee
D. Grasshopper
E. Cockroach

Question 1905:

• WAEC 1996

The phenomenon whereby some organisms get established in an environment after struggling for existence
by taking advantage of some special features possessed by the organism is called

A. Partial selection
B. Artificial selection
C. Natural selection
D. Mutation
E. Competition