Middle lamella starts forming during

Options

A. I-phase
B. Late Metaphase
C. Late Prophase
D. Late Anaphase

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks when the middle lamella starts forming during the cell cycle. The middle lamella is a layer that forms between the cell walls of two daughter plant cells.

2. **Identifying Key Terms**:
- **Middle Lamella**: Also referred to as the cell plate, it is crucial in plant cell division.
- **Cytokinesis**: The process of cell division that follows karyokinesis (nuclear division).

3. **Phases of Cell Division**:
- The cell cycle includes several phases: prophase, metaphase, anaphase, and telophase.
- Karyokinesis occurs first, followed by cytokinesis.

4. **Cytokinesis in Plant Cells**:
- In plant cells, cytokinesis occurs through the formation of a cell plate (middle lamella).
- This process begins during anaphase when vesicles produced by the Golgi apparatus gather at the equator of the cell.

5. **Timing of Middle Lamella Formation**:
- The formation of the middle lamella (cell plate) starts during late anaphase.
- By the end of telophase, cytokinesis is completed, and the middle lamella is fully formed.

6. **Evaluating Answer Options**:
- Option 1: Interphase - Incorrect, as this is not when cytokinesis occurs.
- Option 2: Late Metaphase - Incorrect, as cytokinesis has not started yet.
- Option 3: Late Prophase - Incorrect, as only karyokinesis occurs.
- Option 4: Late Anaphase - Correct, as this is when the middle lamella begins to form.

7. **Conclusion**: The correct answer is **Option 4: Late Anaphase**.

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