Photolysis of water during Photosynthesis occurs with the help of

Options

A. PS- II
B. PS - I
C. Ferredoxin
D. Cytochrome

Answer

**Step-by-Step Solution:**

1. **Understanding Photolysis of Water**: Photolysis of water refers to the process where water molecules are split into hydrogen, oxygen, and electrons. This process is essential during photosynthesis, particularly in the light-dependent reactions.

2. **Identifying the Role of Photosystems**: In photosynthesis, there are two main photosystems: Photosystem I (PS1) and Photosystem II (PS2). Each plays a critical role in the light reactions.

3. **Role of Photosystem II (PS2)**: PS2 is specifically responsible for the photolysis of water. When PS2 absorbs light energy, it excites electrons from chlorophyll, which are then transferred to an electron transport chain.

4. **Electron Transfer and Water Splitting**: The electrons lost by PS2 need to be replenished. This is where the photolysis of water comes into play. Water is split to provide the necessary electrons, which are then used by PS2 to continue the process of photosynthesis.

5. **Chemical Equation**: The photolysis of water can be represented by the equation:
\[ 2H_2O \rightarrow 4H^+ + 4e^- + O_2 \]
This shows that two water molecules yield four protons, four electrons, and one molecule of oxygen.

6. **Conclusion**: Therefore, the correct answer to the question is that the photolysis of water during photosynthesis occurs with the help of **Photosystem II (PS2)**.

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