A few lakes in a major metropolitan city start to become green in colour. Considering that there are numerous high raised apartments and housing complexes near these lakes, what could be the reason for the water turning green?

The sewage water from houses are flowing into the lake

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The amount of organic nutrients has increased in the lake

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The BOD of the lake has increased

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Sudden boom in the growth of algae

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Solution

The correct options are
A The sewage water from houses are flowing into the lake
B The amount of organic nutrients has increased in the lake
D Sudden boom in the growth of algae
Constant dumping of sewage water into the lake increases the amount of rich organic nutrients in the water. Nutrient rich water is ideal for the growth of microbes such as algae. Since the amount of nutrient increases sharply, the growth of the algae is also sudden. This is termed as an algal bloom.

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Similar questions

Fishes died within a few days in a lake near a village. Following are the possible reasons for this:

(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?

(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.

(D) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.

Which two of the above were the main causes of fish mortality in the lake?

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