Dissolved Oxygen (DO), a water quality parameter, is essential in which of the following water bodies/sources? Choose the most appropriate answer from the options given below.

1.River water

2.Lake water

3.Underground water

4.Pond water

A1, 2 and 4 only ✓ Correct

B3 and 4 only

C2, 3 and 4 only

D1, 3 and 4 only

Correct answer: (A) 1, 2 and 4 only

Explanation

Dissolved oxygen matters most in surface waters that host aquatic life, so river, lake and pond water qualify.

Statement 1 is right: flowing river water needs dissolved oxygen for its fish and organisms.

Statement 2 is right: lake water depends on dissolved oxygen to support its aquatic ecosystem.

Statement 3 is wrong: underground water holds little life, so dissolved oxygen is not essential there.

Statement 4 is right: pond water needs dissolved oxygen for the creatures living in it.

A low dissolved oxygen level signals pollution and organic overload in a water body.

Oxygen enters surface water from the air and from photosynthesis by aquatic plants.

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