Plant Nutrition

Step 1: Understand the role of manganese in plants.
Manganese is an essential micronutrient in plants, and it plays a crucial role in the process of photolysis, which is the splitting of water molecules during photosynthesis.
Step 2: Analyze the options.
Manganese is not directly involved in the formation of the cell wall.

It does not play a direct role in nucleic acid synthesis. While it is important for chlorophyll function, its primary role is in photolysis, where it helps in the splitting of water molecules in photosystem II.

Step 3: Conclusion.
The correct answer is (D) photolysis during photosynthesis, as manganese is vital in this process. Conclusion: The correct answer is (D) Photolysis during photosynthesis.