The excessive use of one of the following in agriculture can cause the death of fish in a pond by oxygen starvation. This one is:

(a) fertilisers

(b) manures

(c) pesticides

(d) herbicides

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Solution

(a) fertilisers

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Excessive use of fertilisers and pesticides in agricultural fields mainly leads to ______ pollution.

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(a) Lot of urea and phosphate fertilisers used in crops in the vicinity

(b) Spraying agricultural fields with degradable pesticides

(d) Phytoplankton population declined in the lake

What are the two main causes of fish mortality in the lake?

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Excessive use of chemicals in agriculture can cause environmental pollution.

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