Inhibition of photosynthesis due to photorespiration of a type of

Options

A. Competitive inhibition
B. Non - competitive inhibition
C. Uncompetitive inhibition
D. Feed back inhibition

Answer

### Step-by-Step Solution:

1. **Understanding Photosynthesis and Photorespiration**:
- Photosynthesis is the process where plants use carbon dioxide (CO2) and release oxygen (O2).
- Photorespiration is the process where plants use oxygen (O2) and release carbon dioxide (CO2). This process can inhibit photosynthesis.

2. **Identifying Types of Inhibition**:
- The question asks about the type of inhibition that occurs due to photorespiration affecting photosynthesis. The options provided are:
- Competitive inhibition
- Non-competitive inhibition
- Uncompetitive inhibition
- Feedback inhibition

3. **Explaining Competitive Inhibition**:
- In competitive inhibition, an inhibitor competes with the substrate for binding at the active site of the enzyme. If the inhibitor binds to the active site, the substrate cannot bind, thus inhibiting the reaction.
- In the context of photorespiration, if the enzymes involved in photorespiration bind to the active site, they can inhibit the enzymes necessary for photosynthesis.

4. **Explaining Other Types of Inhibition**:
- **Non-competitive Inhibition**: The inhibitor binds to a site other than the active site, which does not prevent the substrate from binding but prevents the reaction from proceeding.
- **Uncompetitive Inhibition**: The inhibitor binds only to the enzyme-substrate complex, preventing the complex from releasing products.
- **Feedback Inhibition**: The end product of a metabolic pathway inhibits an earlier step in the pathway, leading to a decrease in the pathway's activity.

5. **Conclusion**:
- Based on the definitions and mechanisms of inhibition, the type of inhibition that occurs due to photorespiration affecting photosynthesis is **competitive inhibition**. This is because the enzymes involved in photorespiration compete with those of photosynthesis for binding sites.

### Final Answer:
The correct option is **competitive inhibition**.

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