Longest phase of mitosis is :–

Options

A. Prophase
B. Metaphase
C. Anaphase
D. Telophase

Answer

To determine the longest phase of mitosis, let's analyze the phases of mitosis step by step.

### Step-by-Step Solution:

1. **Understanding Mitosis Phases**: Mitosis is divided into several phases: prophase, metaphase, anaphase, and telophase. Each phase has distinct characteristics and duration.

2. **Identifying Prophase**:
- Prophase is the first phase of mitosis.
- During this phase, chromatin condenses into visible chromosomes.
- The nuclear envelope begins to break down.
- In animal cells, centrioles move towards the poles of the cell.

3. **Identifying Metaphase**:
- In metaphase, chromosomes align at the cell's equatorial plane (metaphase plate).
- This phase is shorter than prophase.

4. **Identifying Anaphase**:
- Anaphase involves the separation of sister chromatids, which move towards opposite poles of the cell.
- This phase is also shorter than prophase.

5. **Identifying Telophase**:
- In telophase, the nuclear membrane re-forms around each set of chromosomes, and the chromosomes begin to de-condense.
- This phase is shorter than prophase as well.

6. **Conclusion**:
- Among all the phases of mitosis, prophase is the longest phase. Therefore, the correct answer to the question is **prophase**.

### Final Answer:
The longest phase of mitosis is **prophase**.