Manganese is required in

Options

A. Plant cell wall formation ____
B. Photolysis of water during photosynthesis
C. Chlorophyll synthesis
D. Nucleic acid synthesis

Answer

**Step-by-Step Solution:**

1. **Understanding the Role of Manganese**: Manganese (Mn) is an essential micronutrient for plants, meaning it is required in small quantities for various physiological processes.

2. **Identifying the Functions of Manganese**: Manganese acts as a cofactor for several enzymes involved in important metabolic processes, including photosynthesis and respiration.

3. **Photosynthesis and Water Splitting**: In the context of photosynthesis, manganese is crucial for the splitting of water molecules (photolysis), which releases oxygen. This process is vital for the overall photosynthetic activity in plants.

4. **Evaluating the Options**:
- **Plant Cell Wall Formation**: This is incorrect as calcium is primarily involved in the formation of plant cell walls.
- **Photosynthesis of Water During Photosynthesis**: This is correct since manganese is essential for the photolysis of water during photosynthesis.
- **Chlorophyll Synthesis**: This is incorrect; iron and magnesium are the main elements required for chlorophyll synthesis.
- **Nucleic Acid Synthesis**: This is also incorrect as nucleic acids primarily require carbon, hydrogen, oxygen, nitrogen, and phosphorus.

5. **Conclusion**: The correct answer is that manganese is required in the photosynthesis of water during photosynthesis.

**Final Answer**: Manganese is required in the photosynthesis of water during photosynthesis.

---