During the past century, lakes and ponds in many parts of the earth have been gradually converted into land.
(a) What is the phenomenon called?
(b) How does human activity accelerate this phenomenon ?
(c) What measures can we take to control this?
Answers
Answer:
(a) Accelerated eutrophication.
(b) Sewage from homes, agricultural waste and Industrial wastes containing nutrients like nitrogen , phosphorus etc.
(c) Domestic sewage and agricultural wastes should be treated before releasing into river / avoid to release in river.
Answer:
The condition is known as accelerated eutrophication; sewage and fertiliser waste can accelerate, and we can assess it by properly decomposing waste rather than allowing it to flow in lakes and ponds.
Explanation:
(A)
Pollutants from human activity, such as wastewater from industry and dwellings, can significantly hasten the ageing of a lake. This is known as cultural or rapid eutrophication.
Lake ageing is another term for natural eutrophication. Humans can hasten the process of eutrophication by rapidly introducing surplus nutrients and silt, causing the lake to shift trophic states in a matter of decades.
(B) human activity gains speed
- Fertilizer runoff from surrounding fields into the water body generates algal bloom, which promotes eutrophication.
- Sewage and industrial effluents raise the temperature and BOD content of the water, resulting in increased biological activity and algal blooms.
- Cultural eutrophication has been linked to blue-green algal blooms, contaminated drinking water sources, reduced recreational options, and hypoxia.
(C) What steps can we take to control
- the diversion of extra nutrients, such as changing nutritional ratios
- shading bodies of water with opaque liners or water-based stains
- application of powerful algaecides and herbicides
- Biomanipulation is the manipulation of a food web in order to restore ecosystem health.