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Effect of Water Pollution on Plants and Animals

Eutrophicatio...

Question

Eutrophication is:

A

Process of nutrient enrichment of water bodies

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B

Process of growing of algae and is fatal to aquatic life

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C

Process of subsequent overgrowth of plants on surface of water

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D

All of the above

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Solution

The correct option is D
All of the above

Eutrophication is the process of nutrient enrichment of water bodies and the subsequent overgrowth of plants on surface of water. It is fatal to the aquatic life.

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Q. Which of the following statements regarding eutrophication are correct ?
(i) Eutrophication is the natural ageing of a lake by nutrient enrichment of its water.
(ii) Pollutants from human activities like effluents from the industries and homes can radically accelerate the aging process of a lake. This phenomenon is called as cultural or accelerated eutrophication.
(iii) The plant nutrients responsible for eutrophication are nitrates and phosphates.
(iv) These phosphates and nitrates accelerate the growth of algae, which utilise oxygen and may deoxygenate the water to kill the fish and other aquatic animals.

Q. We all have seen water bodies, the water is generally clear but at places, the surface of water can be seen covered by green plants, known as Algae. The algae grows on the water surface because of the nutrients in the water body, how does this affect the life of the aquatic organisms?

Q. Assertion :Cultural eutrophication is nutrient enrichment of water bodies due to human activities like passage of sewage, industrial effluents, etc. Reason: The prime contaminants from sewage and industrial effluents are nitrates and phosphates, which act as plant nutrients and overstimulate the growth of algae.

Q. Described below are the three steps in the process of how eutrophication leads to total destruction of aquatic life.

i) Algae grow rapidly and eventually die off.
ii) Decrease in dissolved oxygen in water body.
iii) Increase in nutrient concentrations .

Choose the option which has the correct sequence of these steps.

Q. This process in which nutrient enriched water bodies support a dense plant population, which kills animal life by depriving it of oxygen and results in subsequent loss of biodiversity is known as ________.

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Effect of Water Pollution on Plants and Animals

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