RQ is measured by

Options

A. Auxanometer
B. Ganong's potometer
C. Ganong's Respirometer
D. Drawin's Porometer

Answer

**Step-by-Step Solution:**

1. **Understanding RQ (Respiratory Quotient):**
- RQ, or respiratory quotient, is defined as the ratio of the volume of carbon dioxide (CO2) produced to the volume of oxygen (O2) consumed during respiration.
- Mathematically, it is expressed as:
\[ RQ = \frac{\text{Volume of CO2 produced}}{\text{Volume of O2 consumed}} \]

2. **Identifying the Measurement Tool:**
- To measure RQ, we need a device that can accurately assess both the volume of CO2 released and the volume of O2 absorbed during respiration.

3. **Evaluating the Options:**
- **Option A: Oxanometer** - This device is used for measuring growth in plants, not RQ.
- **Option B: Gannon Photometer** - This instrument measures the transpiration rate in plants, not RQ.
- **Option C: Gannon Respirometer** - This device is specifically designed to measure the rate of respiration, making it suitable for calculating RQ.
- **Option D: Darwin Photometer** - This instrument measures the area of stomatal openings, which is unrelated to RQ.

4. **Conclusion:**
- The correct answer is **Gannon Respirometer**, as it is the tool used to measure the respiratory quotient (RQ) by assessing the volumes of CO2 and O2 involved in respiration.

**Final Answer:**
RQ is measured by **Gannon Respirometer**.

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