A Modern wheat is hexaploid.
R Polyploidy leads to the formation of new varieties.

Options

A. If both As and R are correct and R is correct explanation of As
B. If both As and R are correct but R is not correct explanation of As
C. If As is correct, R is wrong
D. If both As and R are wrong.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "modern wheat is hexaploid."
- Hexaploid means that the wheat has six sets of chromosomes (6n).

2. **Confirming the Assertion**:
- In modern agriculture, wheat has been genetically modified to enhance yield and pest resistance.
- The ploidy level of modern wheat is indeed hexaploid, confirming that the assertion is true.

3. **Understanding the Reason**:
- The reason states that "polyploidy leads to the formation of new varieties."
- Polyploidy refers to organisms that have more than two sets of chromosomes (more than diploid).

4. **Confirming the Reason**:
- Polyploidy can lead to genetic variation, which can result in the development of new varieties of plants, including crops like wheat.
- Therefore, the reason is also true.

5. **Evaluating the Relationship**:
- Both the assertion and the reason are true.
- The reason provides a correct explanation for the assertion, as polyploidy (like that in hexaploid wheat) is a mechanism through which new varieties can be formed.

6. **Conclusion**:
- Since both the assertion and reason are true and the reason correctly explains the assertion, the final answer is that both statements are correct, 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.