| Consider the following statements with reference to eutrophication. |
| 1. It is the natural aging of a lake by biological enrichment of its water. |
| 2. As the lake's fertility increases with more incoming nutrients, plants and animal life burgeons, and organic remains begin to be deposited on the lake bottom. |
| 3. Eutrophication increases oxygen and hence contributes to over production of phytoplankton. |
| Which of the statements given above are correct? |
A) 1 and 3
B) 1 and 2
C) 2 and 3
D) All of these
Correct Answer: B
Solution :
[b] Eutrophication is the natural aging of a lake by biological enrichment of its water. In a young lake the water is cold and clear. supporting little life. With time, streams draining into the lake introduce nutrients such as nitrogen and phosphorus encourage the growth of aquatic organisms. As the lake's fertility increases, plant and animal life burgeons, and organic remains begin to be deposited on the lake bottom.
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