Assertion : The process in which nutrient rich water bodies develop plant population is called eutrophication. ,
Reason : Eutrophication helps in enhancement of plants and animals population by providing them oxygen.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the c orrect explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Explanation

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "the process in which nutrient-rich water bodies develop plant population is called eutrophication."
- Eutrophication is indeed a process characterized by an increase in nutrients, particularly nitrates and phosphates, in water bodies, which leads to the growth of aquatic plants and algae.

2. **Understanding the Reason**:
- The reason provided is that "eutrophication helps in the enhancement of plants and animals population by providing them oxygen."
- While eutrophication does promote the growth of plants, it does not necessarily enhance the population of animals. In fact, the excessive growth of plants can lead to oxygen depletion in the water, which is detrimental to animal life.

3. **Analyzing the Relationship**:
- The assertion is true because it accurately describes the process of eutrophication.
- The reason is false because, although eutrophication can enhance plant growth, it does not provide oxygen to animals; rather, it can lead to reduced oxygen levels, harming aquatic life.

4. **Conclusion**:
- Therefore, the assertion is true, and the reason is false. The correct answer is that the assertion is correct, but the reason is incorrect.

### Final Answer:
- Assertion: True
- Reason: False