Question

Untreated sewage is discharged into the rivers. How will it affect the population of aquatic animals in the river?

• A. Water table decreases
• B. Water table increases
• C. Water table is not dependent on population
• D. Water table will niether increase nor decrease

Answer 1

The correct option is A

Water table decreases

We know that aquatic animals make use of the dissolved oxygen in the water. When untreated sewage is discharged into rivers it reduces the amount of oxygen dissolved in it. So it will become more difficult for aquatic animals to survive.

This is one of the reasons why over years there has been a huge drop in the number of Ganges dolphins.