Assertion: If there is no rainfall or scanty rainfall throughout the year, then xerophytic vegetation occurs.
Reason: Amount or timings of rainfall determine the type of vegetation of an area.

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.

Explanation

To analyze the given assertion and reason, we will break down the statements and evaluate their validity step by step.

### Step 1: Understand the Assertion
The assertion states that "If there is no rainfall or scanty rainfall throughout the year, then xerophytic vegetation occurs."
- **Explanation**: Xerophytic vegetation consists of plants (xerophytes) that are adapted to survive in environments with very little water. These plants have special adaptations such as thick cuticles, deep roots, and the ability to store water, allowing them to thrive in arid conditions.

### Step 2: Understand the Reason
The reason states that "Amount or timings of rainfall determine the type of vegetation of an area."
- **Explanation**: This statement is true because the availability of water is a critical factor in determining what types of plants can grow in a particular area. Different plants have different water requirements, and the amount and timing of rainfall directly influence the types of vegetation that can survive in an environment.

### Step 3: Evaluate the Relationship Between Assertion and Reason
Now we need to determine if the reason provided explains the assertion.
- The assertion is that xerophytic vegetation occurs in conditions of low or no rainfall, and the reason explains that the amount and timing of rainfall determine the type of vegetation. This means that the lack of rainfall (as stated in the assertion) leads to the dominance of xerophytic plants (as supported by the reason).

### Step 4: Conclusion
Both the assertion and the reason are correct, and the reason provides a valid explanation for the assertion. Therefore, the answer to the question is that both the assertion and reason are true, and the reason is the correct explanation of the assertion.

### Final Answer
Both the assertion and reason are true, and the reason is the correct explanation of the assertion.

---