Waec Biology Past Questions and Answers

Question 1876:

• WAEC 1996

In a water culture experiment, the culture solution in a transparent beaker turned green. What precaution
should have been taken to prevent the culture solution from turning green?

A. Changing the culture solution regularly
B. Increasing the number of times the culture is aerated
C. Covering the transparent beaker with black cloth
D. Adding warm alcohol to bleach the green colour
E. Sterilizing the beaker in a hot oven before use

Question 1877:

• WAEC 1996

Which of the following is responsible for the conversion of nitrites to nitrates in the nitrogen cycle?

A. Denitrifying bacteria
B. Nitrifying bacteria
C. Lightening
D. Fungi
E. Brown algae

Question 1878:

• WAEC 1996

Hydra captures small crustaceans by means of

A. Pseudopodia
B. Musculo-epithelial cells
C. Tentacles
D. Enteron
E. Ectoderm

Question 1879:

• WAEC 1996

Which of the following processes is not due to interaction between the biotic and abiotic components of an
ecosystem?

A. Soil nutrient depletion
B. Condensation
C. Decomposition
D. Osmosis
E. Photosynthesis

Question 1880:

• WAEC 1996

The entire habits and habitat of an organism can be described as its

A. Ecological community
B. Ecological niche
C. Habitat factor
D. Biotic factor
E. Abiotic factor