ATP synthesis during photosynthesis is termed as

Options

A. Phosphorylation
B. Oxidative phosphorylation
C. Photophosphorylation
D. Photorespiration

Answer

To answer the question "ATP synthesis during photosynthesis is termed as," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- First, we need to understand the different terms provided in the options: phosphorylation, oxidative phosphorylation, photophosphorylation, and photorespiration.

2. **Phosphorylation**:
- Phosphorylation is a general term that refers to the addition of a phosphate group (inorganic phosphate) to a molecule, such as ADP to form ATP. However, it does not specify the conditions under which this occurs.

3. **Oxidative Phosphorylation**:
- Oxidative phosphorylation occurs in mitochondria and is part of cellular respiration, where nutrients are oxidized to produce ATP. This process is not related to photosynthesis.

4. **Photophosphorylation**:
- Photophosphorylation is the specific process that occurs during photosynthesis where ATP is synthesized in the presence of light. In this process, light energy is used to add inorganic phosphate to ADP, forming ATP.

5. **Photorespiration**:
- Photorespiration is a process that occurs in plants where the enzyme RuBisCO oxygenates RuBP, leading to a decrease in photosynthetic output. It is not related to ATP synthesis.

6. **Conclusion**:
- Since the question specifically refers to ATP synthesis during photosynthesis, the correct term is **photophosphorylation**.

### Final Answer:
The correct answer is **photophosphorylation**.

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