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Standard VII

Biology

Eutrophication

Q6 which of t...

Question

Q6 which of the following are the main effects caused by eutrophication?

i) Species diversity decreases and the dominant biota changes.

ii) Plant and animal biomass increases.

iii) Turbidity decreases.

iv) Rate of sedimentation increases, shortening the lifespan of the lake

Which of the above statements is/are correct?

a) I ii and iii Only

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b) ii, iii and iv Only

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c) i, ii and iv Only

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d) All of the above

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Solution

The correct option is D d) All of the above
6 Ans.D

Explanation: Eutrophication or more precisely hypertrophication is the enrichment of a water body with nutrients, usually with an excess amount of nutrients. This process induces growth of plants and algae and due to the biomass load, may result in oxygen depletion of the water body.

The main effects caused by eutrophication can be summarized as follows:

1. Species diversity decreases and the dominant biota changes

2. Plant and animal biomass increase

3. Turbidity increases

4. Rate of sedimentation increases, shortening the lifespan of the lake

5. Anoxic conditions may develop

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