Photophosphorylation is the process in which

Options

A. `CO_(2)` and `O_(2)` unite
B. Phosphoglyceric acid is produced
C. Aspartic acid is formed
D. Light energy is converted into chemical energy through production of `ATP`.

Answer

**Step-by-Step Solution:**

1. **Understanding Photophosphorylation**: Photophosphorylation is a specific type of phosphorylation that occurs in the presence of light. It is a crucial part of the photosynthesis process where light energy is harnessed.

2. **Role of Light Energy**: In photosynthesis, light energy is absorbed by chlorophyll and other pigments in the chloroplasts. This energy is then used to convert inorganic substances (like water and carbon dioxide) into organic molecules (like glucose).

3. **Conversion to Chemical Energy**: The absorbed light energy is converted into chemical energy in the form of ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate). This conversion is what defines photophosphorylation.

4. **Types of Photophosphorylation**: There are two types of photophosphorylation: cyclic and non-cyclic. In cyclic photophosphorylation, only ATP is produced, while in non-cyclic photophosphorylation, both ATP and NADPH are generated.

5. **Conclusion**: Therefore, the correct definition of photophosphorylation is that it is the process in which light energy is converted into chemical energy through the production of ATP.

**Final Answer**: Light energy is converted into chemical energy through the production of ATP.

---