The period of suspended growth due to exogenous condition is termed as

Options

A. Dormancy
B. Rest
C. Quiescence
D. All of these

Answer

To solve the question regarding the period of suspended growth due to exogenous conditions, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the term that describes a period of suspended growth in plants due to external (exogenous) conditions.

2. **Identify Key Terms**: The key terms in the question are "suspended growth" and "exogenous conditions." This indicates that we are looking for a specific term related to plant growth that is influenced by external factors.

3. **Consider the Options**:
- **a. Dormancy**: This term refers to a period when a plant is inactive and does not grow, often due to unfavorable environmental conditions.
- **b. Rest**: This term can also imply a state of inactivity, similar to dormancy, but may not specifically denote a complete halt in growth.
- **c. Quiescence**: This term refers to a state where a plant is alive but not actively growing, often due to immediate environmental conditions, similar to the G0 phase in cell biology.
- **d. All of these**: This option suggests that all the previous terms are correct and applicable.

4. **Analyze Each Option**:
- Dormancy is indeed a period of suspended growth due to external conditions.
- Rest can be considered a similar state, though it may not fully capture the concept of suspended growth.
- Quiescence is also a valid term that describes a state of inactivity due to external conditions.

5. **Conclusion**: Since all three terms (dormancy, rest, and quiescence) can describe a state of suspended growth due to exogenous conditions, the best answer is **d. all of these**.

### Final Answer:
The period of suspended growth due to exogenous conditions is termed as **d. all of these**.

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