Consider the following statements with respect to algal bloom in water bodies 1 An algal bloom is ca...........

Environment and Ecology Water Pollution

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Consider the following statements with respect to algal bloom in water bodies:

1.An algal bloom is caused because of the presence of large amount of nutrients in the water body.

2.Eutrophication is overnourishment of water bodies due to excessive nitrates and phosphates received through runoff.

3.Algal bloom decreases Biochemical Oxygen Demand (BOD) of the water body.

How many of the statements given above are correct?

Only One

Only Two

All Three

None

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Explanation:

Correct. An algal bloom is indeed often caused by the presence of a large amount of nutrients, particularly nitrogen and phosphorus, in a water body. These nutrients can come from various sources such as agricultural runoff, sewage discharge, and industrial effluents.

Correct. Eutrophication refers to the overnourishment of water bodies due to excessive nutrients, including nitrates and phosphates, typically received through runoff. This process leads to dense growth of plant life and algae and can result in oxygen depletion in the water.

Incorrect. Algal blooms usually increase the Biochemical Oxygen Demand (BOD) of the water body, not decrease it. BOD refers to the amount of oxygen required by aerobic microorganisms to decompose organic matter in water. When algae die and decompose, this process consumes a significant amount of oxygen, thereby increasing the BOD.

Therefore, two of the statements are correct.