Assertion: Hot spots are areas which have been degraded beyond repair.
Reason: There has been adverse changes in environment.

Options

A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
B. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion.
C. If Assertion is true but the Reason is false.
D. If both Assertion and Reason are false.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "Hot spots are areas which have been degraded beyond repair."
- **Analysis**: Biodiversity hotspots are regions that are rich in biodiversity but are also under threat from human activities. They are not necessarily degraded beyond repair; rather, they are areas that need conservation efforts to protect their biodiversity.

2. **Understanding the Reason**: The reason provided is "There has been adverse changes in the environment."
- **Analysis**: While it is true that biodiversity hotspots can experience adverse environmental changes, this statement alone does not justify the assertion. Adverse changes can occur in many environments, not just in hotspots.

3. **Evaluating the Truth of the Assertion**: Since biodiversity hotspots are not defined as areas that are degraded beyond repair, the assertion is false.

4. **Evaluating the Truth of the Reason**: The reason states that there have been adverse changes in the environment, which can be true in many contexts, including hotspots. However, it does not specifically validate the assertion. Therefore, the reason is also false in the context of explaining the assertion.

5. **Conclusion**: Since both the assertion and the reason are false, the correct option is that both assertion and reason are false.

### Final Answer:
The correct option is D: Both assertion and reason are false.