Division of nucleus is indirect in

Options

A. Mitosis and Meiosis
B. Meiosis and fertilisation
C. Amitosis
D. Both (1) and (2)

Answer

**Step-by-Step Solution:**

1. **Understanding Cell Division Types**:
- There are three main types of cell division: amitosis, mitosis, and meiosis.
- Amitosis is a direct form of cell division, while mitosis and meiosis are considered indirect forms.

2. **Defining Amitosis**:
- Amitosis is characterized by the direct division of the nucleus and cytoplasm without the formation of distinct stages.
- An example of amitosis is binary fission, which occurs in organisms like amoeba.

3. **Defining Mitosis and Meiosis**:
- Mitosis is known as equational division, where one cell divides to form two identical daughter cells.
- Meiosis is known as reductional division, which reduces the chromosome number by half and results in four genetically diverse cells.

4. **Phases of Mitosis and Meiosis**:
- Both mitosis and meiosis consist of several distinct phases: prophase, metaphase, anaphase, and telophase.
- In these processes, the nucleus undergoes complex changes, including chromosome condensation, alignment at the equatorial plate, and separation of sister chromatids.

5. **Conclusion**:
- Since mitosis and meiosis involve multiple stages and complex processes for the division of the nucleus, they are classified as indirect forms of cell division.
- Therefore, the correct answer to the question "Division of nucleus is indirect in" is mitosis and meiosis.

**Final Answer**: The division of the nucleus is indirect in mitosis and meiosis.

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