Which of the following statements does not apply to eutrophication?

Options

A. It is natural ageing of lake by nutrient enrichment of its water
B. In a young lake the water is cold and clear and supports less life
C. The nutrients such as sulphur and phosphorous encourage the growth of aquatic organisms in the lake
D. Pollutants released by man radically accelerated the ageing process of a lake

Answer

**Step-by-Step Solution:**

1. **Understanding Eutrophication:**
- Eutrophication is the process through which a water body, such as a lake, becomes nutrient-rich, leading to excessive growth of algae (algal blooms). This process can eventually result in the aging of the lake and loss of aquatic life.

2. **Identifying the Causes:**
- The primary causes of eutrophication are pollutants, particularly nutrients like phosphates and sulfates. These nutrients promote the growth of algae, which can lead to a decrease in dissolved oxygen levels in the water.

3. **Analyzing the Statements:**
- The question asks which statement does not apply to eutrophication. We need to evaluate each statement provided in the question.

4. **Evaluating Each Statement:**
- **Statement 1:** "It is natural aging of lake by nutrient enrichment of its water."
- This statement is true as eutrophication involves nutrient enrichment leading to the aging of the lake.

- **Statement 2:** "In a young lake, the water is cold and clear and supports less life."
- This statement is false. A young lake typically has clear and cold water, which supports more life, not less.

- **Statement 3:** "The nutrients such as sulphur, phosphorous encourage the growth of aquatic organisms in the lake."
- This statement is somewhat misleading. While nutrients do encourage the growth of algae, they do not support a diverse range of aquatic life due to the eventual depletion of oxygen.

- **Statement 4:** "Pollutants released by man radically accelerated the aging process of a lake."
- This statement is true as human activities, such as the release of detergents containing phosphates, significantly speed up the eutrophication process.

5. **Conclusion:**
- The statement that does not apply to eutrophication is **Statement 2**: "In a young lake, the water is cold and clear and supports less life."