`Q_(10)` refers to

Options

A. Temperature quotient
B. Respiratory quotient
C. Compensation point
D. Time factor

Answer

To solve the question regarding what Q10 refers to, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Options**: The options provided are:
- Temperature Quotient
- Respiratory Quotient
- Compensation Point
- Time Factor

2. **Define Q10**: Q10 is a term used in biology and ecology that refers to the temperature coefficient. It indicates how the rate of a biological or chemical process changes with a 10-degree Celsius increase in temperature.

3. **Analyze Each Option**:
- **Temperature Quotient**: This is defined as the factor by which the rate of a reaction increases for every 10-degree rise in temperature. This matches the definition of Q10.
- **Respiratory Quotient (RQ)**: This is the ratio of carbon dioxide produced to oxygen consumed during respiration. This does not relate to Q10.
- **Compensation Point**: This is the light intensity at which the rate of photosynthesis equals the rate of respiration. This is not related to temperature changes.
- **Time Factor**: This generally refers to the influence of time on biological processes but does not specifically relate to temperature.

4. **Conclusion**: Based on the definitions and analysis, the correct answer to what Q10 refers to is **Temperature Quotient**.

### Final Answer:
The correct answer is **Temperature Quotient** (Option 1).

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