Which one of the following is a incorrect statement?

Options

A. Greenhouse effect is a natural phenomenon
B. Eutrophication is a natural phenomenon in fresh water bodies
C. most of the forests have been lost in tropical areas
D. ozone in upper part of atmosphere is harmful to animals

Answer

To determine which statement is incorrect, let's analyze each of the provided statements one by one:

1. **Statement 1: Greenhouse effect is a natural phenomenon.**
- The greenhouse effect is indeed a natural process that occurs when certain gases in the Earth's atmosphere trap heat, keeping the planet warm enough to support life. This statement is correct.

2. **Statement 2: Eutrophication is a natural phenomenon in freshwater bodies.**
- Eutrophication refers to the process where water bodies become enriched with nutrients (like phosphates), leading to excessive growth of algae. This can occur naturally, but it is often accelerated by human activities. However, the statement is generally accepted as correct in the context of natural processes.

3. **Statement 3: Most of the forests have been lost in tropical areas.**
- It is true that a significant percentage of forests, particularly tropical forests, have been lost due to deforestation and other human activities. This statement is also correct.

4. **Statement 4: Ozone in the upper part of the atmosphere is harmful to animals.**
- Ozone in the stratosphere (upper atmosphere) is known as "good ozone" because it protects living organisms from harmful ultraviolet (UV) radiation. Therefore, this statement is incorrect as it suggests that stratospheric ozone is harmful, which contradicts its protective role.

**Conclusion:**
The incorrect statement is: **"Ozone in the upper part of the atmosphere is harmful to animals."**

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