A few lakes in a 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 and why

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Solution

The reason for lakes turning green is the growth of algaes.Algae growth is spurred by two main sources of pollution: fertilizer runoff from farms and discharge from sewage treatment plants. Both add nitrogen and phosphorus to waterways, two nutrients that are essential to algae growth.
Due to the rise in apartment the waste from these places reaches the lake which favours the algae growth.

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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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