Assertion :- Cells in quiscent stage `(G_(0))` are metabolically inactive, so don't show cell division.
Reason :- Quiscent stage appears on exit of cell cycle.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are false.

Answer

**Step-by-Step Solution:**

1. **Understanding the Assertion:**
- The assertion states that cells in the quiescent stage (G0) are metabolically inactive and do not show cell division.
- This needs to be evaluated for its correctness.

2. **Evaluating the Assertion:**
- The G0 phase is a resting state where cells are not actively preparing to divide.
- However, it is incorrect to say that cells in G0 are metabolically inactive. They are metabolically active, performing basic cellular functions, but they are not engaged in cell division or synthesizing new organelles necessary for division.
- Therefore, the assertion is **false**.

3. **Understanding the Reason:**
- The reason provided states that the quiescent stage appears on the exit of the cell cycle.
- This implies that G0 is a phase that occurs after the cell has completed its division.

4. **Evaluating the Reason:**
- While G0 can occur after mitosis or meiosis, it is not exclusively at the exit of the cell cycle. Cells can enter G0 at different points based on environmental conditions or cellular signals.
- Thus, the reason is also **false**.

5. **Conclusion:**
- Since both the assertion and the reason are false, the final answer is that both the assertion and the reason are incorrect.