Select the incorrect statement.

Options

A. In the 24 hour average durative of cell cycle of a human cell, division proper lasts for only about an hour.
B. The interphase lasts more than 95% of the duration of cell cycle.
C. Even after S phase the number of chromosomes remains the same , i.e., 2n
D. In plant cell, during the S phase , DNA replication begins in the nucleus, and the centriole duplicates in the cytoplasm.

Answer

To solve the question of selecting the incorrect statement regarding the cell cycle, we will analyze each statement provided in the question step by step.

### Step-by-Step Solution:

1. **Understanding the Cell Cycle**:
- The cell cycle consists of two main phases: Interphase and M-phase (Mitotic phase).
- Interphase is the longer phase, accounting for about 95% of the cell cycle, while M-phase accounts for about 5%.

2. **Analyzing Statement A**:
- **Statement A**: "In the 24 hours average duration of cell cycle of a human cell, division proper lasts for only about an hour."
- This statement is correct because the M-phase typically lasts for about 1 hour in a 24-hour cell cycle.

3. **Analyzing Statement B**:
- **Statement B**: "The interphase lasts more than 95% of the duration of the cell cycle."
- This statement is also correct, as interphase indeed constitutes the majority of the cell cycle duration.

4. **Analyzing Statement C**:
- **Statement C**: "Even after S phase the number of chromosomes remains the same that is 2N."
- This statement is correct. During the S phase, the DNA content doubles (from X to 2X), but the number of chromosomes remains at 2N.

5. **Analyzing Statement D**:
- **Statement D**: "In plant cells during S phase DNA replication begins in the nucleus and the centriole duplicates in the cytoplasm."
- This statement is incorrect. Higher plant cells do not have centrioles; they use microtubules for spindle formation during cell division. Additionally, centriole duplication occurs in the G2 phase in animal cells, not during the S phase.

### Conclusion:
Based on the analysis, the incorrect statement is **Statement D**.

### Final Answer:
**The incorrect statement is D.**

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