Assertion : Nucleopolyhedrovirus used as biocontrol agent
Reason : It kills insects and pests

Options

A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A and R are false

Answer

To solve the question regarding the assertion and reason related to Nucleopolyhedrovirus (NPV) as a biocontrol agent, we can break down the solution into the following steps:

### Step-by-Step Solution

1. **Understanding the Assertion**:
- The assertion states that "Nucleopolyhedrovirus is used as a biocontrol agent."
- Nucleopolyhedroviruses are a type of virus that specifically infects insects, particularly members of the order Lepidoptera (which includes moths and butterflies).

**Hint**: Look for definitions of biocontrol agents and their functions.

2. **Understanding the Reason**:
- The reason states that "It kills insects and pests."
- Nucleopolyhedroviruses have insecticidal properties. They infect and ultimately kill the host insects, making them effective in controlling pest populations.

**Hint**: Consider how viruses can be used in pest control and their mechanism of action.

3. **Connecting Assertion and Reason**:
- The assertion is true because NPV is indeed used as a biocontrol agent.
- The reason is also true because NPV kills insects and pests, which is the mechanism through which it acts as a biocontrol agent.

**Hint**: Think about how the reason supports the assertion.

4. **Conclusion**:
- Since both the assertion and reason are true, and the reason explains the assertion, we can conclude that both statements are correct and that the reason provides a valid explanation for the assertion.

**Hint**: Check if the reason logically supports the assertion.

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

### Summary of Options
- **Option A**: Both assertion and reason are true, and the reason is the correct explanation for the assertion. (Correct answer)