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Q90 (CAPF/2026) Environment & Ecology › Pollution & Conservation

Which of the following statements about eutrophication is/are correct?
1. Eutrophication takes place in young lakes when the water is cold and clear.
2. Eutrophication is caused by nutrient enrichment in water bodies.
Select the answer using the code given below.

Result
Your answer: —  ·  Correct: B

Explanation

Eutrophication is defined as the natural aging of a lake by biological enrichment of its water. Statement 2 is correct because the process is primarily caused by the enrichment of nutrients like nitrogen and phosphorus, which leads to excessive algal growth (algal blooms).

Statement 1 is incorrect because in a young lake, the water is typically cold and clear, supporting very little life; this state is known as oligotrophic. Eutrophication is the process through which these young, clear lakes gradually become nutrient-rich, shallower, and warmer over time. Therefore, eutrophication is the transition away from the cold and clear state, rather than a process that occurs while the lake remains in that initial condition.

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