Which of the following statements is correct?

Options

A. Micronucleus is made of trophochro- matin.
B. Macronucleus is made of trophochro- matin.
C. Micronucleus is made of idiochromatin
D. Both (2) and (3) are correct.

Answer

To determine which of the statements regarding the micronucleus and macronucleus is correct, we can analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Micronucleus and Macronucleus**:
- The micronucleus and macronucleus are two types of nuclei found in certain protists, such as Paramecium.
- The micronucleus is primarily involved in reproduction and heredity.
- The macronucleus is responsible for metabolic functions and overall cellular activities.

2. **Analyzing the Statements**:
- **Option 1**: "Micronucleus is made up of tropochromatin."
- This statement is incorrect. The micronucleus is actually made up of iodochromatin.
- **Option 2**: "Macronucleus is made up of tropochromatin."
- This statement is also incorrect. The macronucleus is made up of prochromatin.
- **Option 3**: "Micronucleus is made up of hydrochromatin."
- This statement is incorrect as well; the micronucleus is not made of hydrochromatin.
- **Option 4**: "Both these statements second and third are correct."
- Since both statements 2 and 3 are incorrect, this option is also incorrect.

3. **Conclusion**:
- After analyzing all the options, it is clear that none of the statements provided in the options are correct. The correct composition of the micronucleus is iodochromatin, and the macronucleus is made up of prochromatin.

### Final Answer:
None of the statements are correct.

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