With reference to a fresh water lake, consider the following characteristics:
1. Richness in nutrients
2. Rapid turnover of phytoplankton
3. Depletion of dissolved oxygen
Which of the above is/are observed in a lake after its eutrophication?

A. 1 only

B. 1 and 2 only

C. 3 only

D. 1, 2 and 3

Answer: Option D

Solution(By Examveda Team)

Depletion of dissolved oxygen is observed in a lake after its eutrophication. Eutrophication is the process by which a body of water becomes enriched in dissolved nutrients (as phosphates), stimulating the growth of aquatic plant life usually resulting in the depletion of dissolved oxygen.