Assertion. In bacteria the chromosome is irregularly folded into a compact mass, the nucleoid or genophore of definite form.
Reason. In bacteria there is no organised nucleus.

Options

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

Answer

To solve the given question, we need to analyze the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that in bacteria, the chromosome is irregularly folded into a compact mass known as the nucleoid or genophore of definite form.
- This is true because bacterial chromosomes are indeed organized in a way that is different from eukaryotic chromosomes. In bacteria, the DNA is not enclosed within a membrane-bound nucleus but is instead found in a region of the cytoplasm called the nucleoid.

2. **Understanding the Reason**:
- The reason states that in bacteria, there is no organized nucleus.
- This is also true. Bacteria are prokaryotic organisms, which means they do not have a true nucleus. Instead, their genetic material is located in the nucleoid, which lacks a surrounding membrane.

3. **Evaluating the Relationship**:
- The assertion is correct as it accurately describes the structure of bacterial chromosomes.
- The reason is also correct as it explains the absence of a true nucleus in bacteria.
- Furthermore, the reason correctly explains why the chromosome is folded into a compact mass (the lack of a true nucleus leads to the formation of the nucleoid).

4. **Conclusion**:
- Both the assertion and the reason are true, and the reason correctly explains the assertion.

### Final Answer:
- Both the assertion and the reason are true, and the reason correctly explains the assertion.