Which of the following is photophosphorylation

Options

A. Production of ATP from ADP
B. Production of NADP
C. Synthesis of ADP from ATP
D. Production of PGA

Explanation

**Step-by-Step Solution:**

1. **Understanding Photophosphorylation**: Photophosphorylation is a process that occurs during photosynthesis in plants, where light energy is used to convert ADP (adenosine diphosphate) into ATP (adenosine triphosphate) by adding a phosphate group.

2. **Analyzing the Options**:
- **Option A**: Production of ATP from ADP - This describes the process of phosphorylation where a phosphate group is added to ADP to form ATP, which is indeed photophosphorylation.
- **Option B**: Production of NADP - This is related to the reduction of NADP+ to NADPH during photosynthesis but does not describe photophosphorylation.
- **Option C**: Synthesis of ADP from ATP - This is the reverse process and is not related to photophosphorylation.
- **Option D**: Production of PGA - This refers to the formation of 3-phosphoglycerate in the Calvin cycle, which is also not related to photophosphorylation.

3. **Identifying the Correct Answer**: Based on the analysis, the correct answer is **Option A**: Production of ATP from ADP, as this accurately describes the process of photophosphorylation.

4. **Conclusion**: Therefore, the answer to the question "Which of the following is photophosphorylation?" is **Option A**: Production of ATP from ADP.

---