JAMB Chemistry 2013 Objective — Question 17

Question 17 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2013 Objective paper, with the correct answer and a full explanation.

In a water body, too much sewage leads to

A. an increase in the bacterial population which reduces the level of oxygen in the waterCorrect
B. a decrease in bacterial population which increases the level of oxygen in the water
C. a decrease in the temperature of the water which causes death of aquatic animals
D. an increase in the number of aquatic animals in the water

Explanation

Too much sewage causes the population of (usually aerobic) bacteria to increase, which consequently decreases the level of oxygen in the water body.

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