Assertion : The purpose of crop improvement is to develop varieties with desirable characters.
Reason : Plant breeders are concerned with crop improvement.

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 correct 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 purpose of crop improvement is to develop varieties with desirable characters. This means that the main goal of improving crops is to create new varieties that have specific traits that are beneficial for agriculture, such as higher yield, better taste, or resistance to diseases.

**Hint**: Think about what traits would make a crop more desirable for farmers and consumers.

2. **Understanding the Reason**: The reason provided is that plant breeders are concerned with crop improvement. This indicates that plant breeders, who are experts in genetics and agriculture, play a crucial role in the process of improving crops.

**Hint**: Consider the role of plant breeders and how their work contributes to the goals of crop improvement.

3. **Evaluating the Assertion**: The assertion is indeed correct because the primary aim of crop improvement is to develop varieties that possess desirable traits. This aligns with the goals of agricultural science.

**Hint**: Reflect on the various traits that are typically targeted in crop improvement programs.

4. **Evaluating the Reason**: While the reason is also true—plant breeders are indeed involved in crop improvement—it does not serve as a justification for the assertion. The reason does not explain why the purpose of crop improvement is to develop desirable characters.

**Hint**: Think about whether the reason directly supports or explains the assertion.

5. **Conclusion**: Since both the assertion and the reason are true, but the reason does not correctly explain the assertion, the final answer is that both statements are true, but the reason is not the correct explanation for the assertion.

**Final Answer**: B - Both assertion and reason are true, but the reason is not the correct explanation of the assertion.