WAEC Biology 2018 Objective — Question 30

Question 30 of 50 from the West African Examinations Council (WAEC) Biology 2018 Objective paper, with the correct answer and a full explanation.

The diagram below is an illustration of organisms in an air-tight aquarium. The most important factor needed by the organisms is

A. light energyCorrect
B. low humidity
C. oxygen
D. nitrate

Explanation

Since the aquatic organisms rely on already-dissolved oxygen and plant photosynthesis to replenish it, light energy is the most critical factor to sustain the closed system.

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