____ is the process of synthesis of ATP from ADP and Pi in the presence of light.

Options

A. Phosphorylation
B. Photophosphorylation
C. Photosystem
D. Oxidative phosporylation

Explanation

**Step-by-Step Solution:**

1. **Understanding the Components**: The question asks about a specific process involving the synthesis of ATP. ATP (adenosine triphosphate) is formed from ADP (adenosine diphosphate) and inorganic phosphate (Pi).

2. **Identifying the Process**: The synthesis of ATP from ADP and Pi occurs through a process that requires energy. In this context, the energy comes from light.

3. **Naming the Process**: When ATP is synthesized in the presence of light, this process is specifically referred to as "photophosphorylation."

4. **Role of Enzymes**: The enzyme involved in this process is known as ATPase or ATP synthetase, which facilitates the conversion of ADP and Pi into ATP.

5. **Location of the Process**: Photophosphorylation occurs in the chloroplasts of plant cells during the light-dependent reactions of photosynthesis.

6. **Conclusion**: Therefore, the answer to the question is "Photophosphorylation."

**Final Answer**: Photophosphorylation is the process of synthesis of ATP from ADP and Pi in the presence of light.

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