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Question

A lake which is rich in organic waste may result in
  1. Increased population of fish due to lots of nutrients
  2. Drying of the lake due to algal bloom
  3. Mortality of fish due to lack of oxygen
  4. Increased population of aquatic organisms due to minerals

A
Increased population of aquatic organisms due to minerals
B
Drying of the lake due to algal bloom
C
Increased population of fish due to lots of nutrients
D
Mortality of fish due to lack of oxygen
Solution
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A lake rich in organic waste favors algal bloom. Excess algal population covers the water surface and the underground plants die due to lack of Sunlight. Available dead and decaying plants favor microbial growth. Microbes use dissolved oxygen in the decomposition of organic waste and reduce the available oxygen for water animals and fishes. The reduced available dissolved oxygen causes fishes mortality.
Therefore, the correct answer is option B.

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