Waec Biology Past Questions and Answers

Question 416:

• WAEC 1995

An association between two organisms in which both benefit is called

A. Parasitism
B. Commensalism
C. Symbiosis
D. Predation
E. Competition

Question 417:

• WAEC 1995

Which of the following is not an outcome of ecological succession?

A. There is a progressive change in species structure, organic matter and energy flow
B. The climax stage consists of a comparatively long lasting species composition
C. There is no dynamic equilibrium between the community and habitat in the climax stage
D. Communities occurring later in the sequence of succession are more complex
E. There are fewer dominant species in the late stages of succession.

Question 418:

• WAEC 1995

Which of the following is not an effect of over-crowding on a population?

A. Death
B. Competition
C. Commensation
D. Aggression
E. Cannibalism

Question 419:

• WAEC 1995

The diagram above represent the shape of major group of bacteria
The groups staphylococci and streptobacilli are represented by

A. I and II
B. II and IV
C. III and VII
D. IV and VII
E. IV and VIII

Question 420:

• WAEC 1995

Prevention of erosion could best be carried out by

A. Crop rotation and mulching
B. Contouring of slopping ground and afforestation
C. Grazing terracing and shifting cultivation
D. Strip cropping and poaching
E. Bush fallowing and crop rotation.