which one of the following elements is required for photosynthesis oxygen evolution

Options

A. Copper
B. Iron
C. Manganese
D. Zinc

Answer

### Step-by-Step Solution:

1. **Understanding the Process of Photosynthesis**:
- Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy, producing glucose and oxygen as byproducts.

2. **Identifying Oxygen Evolution**:
- Oxygen evolution refers to the release of oxygen during photosynthesis, specifically during the light-dependent reactions where water molecules are split into oxygen, protons, and electrons.

3. **Recognizing the Role of Water**:
- In the light reactions, water (H₂O) is split (a process called photolysis) to provide electrons for the photosynthetic electron transport chain, resulting in the release of oxygen.

4. **Identifying the Key Elements Involved**:
- Various elements are involved in the photosynthetic process, but specific elements are crucial for the oxygen evolution part. The options provided are copper, iron, manganese, and zinc.

5. **Determining the Correct Element**:
- Among the options, manganese is specifically required for the functioning of the oxygen-evolving complex (OEC), which is essential for the splitting of water molecules during photosynthesis.

6. **Understanding the Oxygen Evolving Complex (OEC)**:
- The OEC is a part of Photosystem II and contains manganese and calcium. It is responsible for the oxidation of water and the release of oxygen.

7. **Conclusion**:
- Therefore, the element required for photosynthesis oxygen evolution is **manganese**.

### Final Answer:
Manganese is required for photosynthesis oxygen evolution.

---