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A lake near a village suffered heavy mor...

A lake near a village suffered heavy mortality of fishes within a few days Consider the following reasons for this?
(a) Lots of urea and phosphate fertilizers were used in the crops in the vicinity.
(b) The area was sprayed with DDT by an aircraft.
(c) The lake water turned green and stinky.
(d) Phytoplankton population in the lake declined initially thereby greatly reducing photosynthesis. Which two of the above were the main causes of fish mortality in the lake?

A

(2) and (3)

B

(3) and (4)

C

(1) and (3)

D

(1) and (2)

Text Solution

Verified by Experts

The correct Answer is:
C
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A lake near a village suffered heavy mortality of fishes within a few days. Which of the following statements could be the correct explanation for this ? (i) Lots of urea and phosphate fertillisers were used in the crops in the nearby fields. (ii) The croplands of the village were fertillised fields rich in nitrate and phosphate. (iii) The lake water turned green and stinky. (iv) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.

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