Consider the following statements with respect to water pollution 1 Increase in the level of Dissolv...........

Environment and Ecology Water Pollution

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Consider the following statements with respect to water pollution

1.Increase in the level of Dissolved oxygen is an indicator of water pollution.

2.Organic pollutants produce dissolved oxygen

3.Thermal pollutants decrease dissolved oxygen in the water bodies.

How many of the statements given above are correct?

Only One

Only Two

All Three

None

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Explanation:

Incorrect: An increase in the level of Dissolved Oxygen (DO) is generally not an indicator of water pollution. Usually, higher DO levels indicate healthier water conditions, as oxygen is crucial for aquatic life.

Incorrect: Organic pollutants do not produce dissolved oxygen. Instead, when organic pollutants are present in water, they are broken down by bacteria, a process which consumes dissolved oxygen, potentially leading to lower DO levels.

Correct: Thermal pollutants, such as warm water discharged from industrial processes, can decrease the level of dissolved oxygen in water bodies. Warmer water holds less oxygen than cooler water.

Therefore, only statement 3 is correct.