Waec Biology Past Questions and Answers

Question 281:

• WAEC 1993

The following are features of Northern Guinea Savanna except

A. Presence of tall trees with thick bark
B. Bare soil with very few trees
C. Presence of fire-resistant trees
D. Abundant herbivores
E. Predominance of woody trees.

Question 282:

• WAEC 1993

Which of the following explains the term pyramid of numbers?

A. The number of organisms in a trophic level
B. The relationship between plants in different trophic levels
C. The number of saprophytes and parasites in a habitat
D. The number of predators in a habitat
E. Progressive decrease in the number of individuals from lower to higher trophic level

Question 283:

• WAEC 1993

In which of the following processes is carbondioxide not given out?

A. Respiration in plants
B. Decay of organism
C. Burning of organic matter
D. Burning of fuels
E. During photosynthesis.

Question 284:

• WAEC 1993

Sea water taken in by a living organism can be recycled into the atmosphere through all the following
processes except

A. Transpiration
B. Digestion
C. Excretion
D. Respiration
E. Decay

Question 285:

• WAEC 1993

Which of the following water pollutant may contain organisms that cause dysentery?

A. Pesticides
B. Sewage
C. Industrial wastes
D. Fertilizers
E. Crude oil.