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Class 12th Biology 2014 Set1 Delhi Board Paper Solution

Question 8

State the cause of accelerated eutrophication.


Accelerated eutrophication:

It is the ageing of a water body due to nutrient enrichment of its water. It can be natural or artificial. Eutrophication takes thousands of years, but due to human activities the process has been accelerated. So, it is called accelerated eutrophication.

Causes of accelerated eutrophication:

1) Release of nutrient-rich sewage and industrial effluents lead to the introduction of nutrients such as nitrogen and phosphorus.

2) Sewage and industrial effluents also lead to increase in temperature and BOD of the water body, causing increased biological activity, thereby leading to algal blooms.