A) drying of the lake very soon due to algal bloom
B) an increased production of fish due to lot of nutrients
C) death of fish due to lack of oxygen
D) increased population of aquatic food web organisms
Correct Answer: C
Solution :
Due to addition of domestic wastes (sewage, phosphates, nitrates etc.) water body become rich in nutrients. With the addition of nutrients, there is stimulated luxuriant growth of algae in water leads to algal blooms. The algal blooms compete with other aquatic plants for light and .photosynthesis. Thus oxygen level is depleted. Moreover, these blooms also release some toxic chemicals which kill fish, birds and other animals.
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