Ganong's respiroscope is used to demonstrate…………………

Options

A. evolution of `O_2` in photosynthesis
B. evolution of `CO_2` in photosynthesis
C. evolution of `CO_2` in aerobic respiration
D. evolution of heat in aerobic respiration

Answer

### Step-by-Step Solution:

1. **Understanding Ganong's Respiroscope**:
- Ganong's Respiroscope is a type of respirometer, which is a glass apparatus used to measure the rate of respiration in plants.

2. **Function of the Respiroscope**:
- The primary function of the Ganong's Respiroscope is to measure the intake of oxygen and the release (or liberation) of carbon dioxide during the process of respiration.

3. **Aerobic Respiration**:
- The respiroscope specifically demonstrates aerobic respiration, which occurs in the presence of oxygen. During this process, oxygen is consumed, and carbon dioxide is produced.

4. **Identifying the Correct Answer**:
- The question asks what Ganong's Respiroscope is used to demonstrate. The correct answer is the liberation of carbon dioxide during aerobic respiration.
- Evaluating the options:
- **Option A**: Evolution of oxygen in photosynthesis - Incorrect.
- **Option B**: Evolution of carbon dioxide in photosynthesis - Incorrect.
- **Option C**: Evolution of carbon dioxide in aerobic respiration - Correct.
- **Option D**: Evolution of heat in aerobic respiration - Incorrect.

5. **Conclusion**:
- Therefore, the correct answer is **Option C: Evolution of carbon dioxide in aerobic respiration**.