Photolysis of water takes place during

Options

A. PS I
B. PS II
C. Both A and B
D. None of these

Answer

**Step-by-Step Solution:**

1. **Understanding Photolysis of Water**: Photolysis refers to the process of breaking down water (H2O) using light energy. The term 'photo' indicates light (specifically sunlight), and 'lysis' means breakdown.

2. **Identifying the Process**: Photolysis of water occurs during photosynthesis, specifically in the light-dependent reactions. This process is crucial for the production of oxygen and the generation of energy carriers (ATP and NADPH).

3. **Role of Photosystems**: In plants, there are two types of photosystems involved in photosynthesis: Photosystem I (PSI) and Photosystem II (PSII).
- Photosystem II (PSII) is primarily responsible for the photolysis of water.
- It absorbs light energy and uses it to split water molecules.

4. **Products of Photolysis**: When water is split during photolysis, several products are generated:
- Four electrons (e-) are released from two water molecules.
- Four protons (H+) are produced.
- One molecule of oxygen (O2) is released as a byproduct.

5. **Conclusion**: Therefore, the photolysis of water takes place during the light-dependent reactions of photosynthesis, specifically associated with Photosystem II.

**Final Answer**: Photolysis of water takes place during the light-dependent reactions of photosynthesis, specifically in Photosystem II.

---