Which of the following influences feed back inhibition of Photosynthesis

Options

A. Chlorophyll degration
B. Hight lightintensity
C. Low `CO_2` concentration
D. Carbohydrate accumulation

Answer

### Step-by-Step Solution:

1. **Understanding Feedback Inhibition**:
- Feedback inhibition is a regulatory mechanism where the end product of a process inhibits its own production. In the context of photosynthesis, this means that the accumulation of certain products can slow down or stop the process of photosynthesis.

2. **Identifying the Options**:
- The options provided are:
1. Chlorophyll degradation
2. High light intensity
3. Low CO2 concentration
4. Carbohydrate accumulation

3. **Analyzing Each Option**:
- **Chlorophyll Degradation**: This refers to the breakdown of chlorophyll, which is essential for photosynthesis. While it can affect photosynthesis, it does not directly influence feedback inhibition.
- **High Light Intensity**: Increased light intensity can enhance the rate of photosynthesis but does not cause feedback inhibition.
- **Low CO2 Concentration**: A low concentration of CO2 can limit photosynthesis but does not lead to feedback inhibition.
- **Carbohydrate Accumulation**: The accumulation of carbohydrates (the end products of photosynthesis) can inhibit the process itself, as it signals that there is enough energy stored, thus slowing down further photosynthesis.

4. **Conclusion**:
- Among the given options, carbohydrate accumulation is the factor that influences feedback inhibition of photosynthesis. Therefore, the correct answer is **Carbohydrate accumulation**.