Element essential for photolysis of water is

Options

A. (a) Nitrogen
B. (b) Chlorine
C. (c) Carbon
D. (d) Oxygen

Answer

To answer the question "Element essential for photolysis of water," we can follow these steps:

### Step-by-Step Solution:

1. **Understand Photolysis of Water**:
- Photolysis of water refers to the process where water molecules are split into electrons, protons, and oxygen in the presence of light. This reaction occurs during photosynthesis, specifically in the chloroplasts of plant cells.

2. **Identify the Location of the Reaction**:
- This reaction takes place in Photosystem II, which is part of the light-dependent reactions of photosynthesis.

3. **Recognize the Inputs and Outputs**:
- The input for this reaction is water (H2O), and the outputs are electrons, protons (H+ ions), and oxygen (O2). The oxygen produced is released as a by-product.

4. **Determine Essential Elements**:
- The essential elements required for the photolysis of water include manganese, chloride ions, and calcium ions. These elements play crucial roles in facilitating the reaction.

5. **Analyze the Given Options**:
- The options provided are:
A) Nitrogen
B) Chlorine
C) Carbon
D) Oxygen
- Based on our understanding, nitrogen, carbon, and oxygen are not directly involved in the photolysis of water. Chlorine, however, is one of the essential elements mentioned.

6. **Select the Correct Answer**:
- Therefore, the correct answer to the question is **B) Chlorine**.

### Final Answer:
The element essential for the photolysis of water is **Chlorine (B)**.