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Biology Question 109 – NEET-UG 2023

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Which micronutrient is required for splitting of water molecule during photosynthesis?

Recall the light-dependent reactions of photosynthesis, specifically the events occurring at Photosystem II.

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Ninja Strategy•Specific Micronutrient Function

Recall the specific roles of each micronutrient in plant physiology to identify the one directly involved in the photolysis of water during photosynthesis.

Step 1: Identify the Process✦ Active

The question refers to the splitting of water molecules during photosynthesis, which is known as photolysis or the oxygen-evolving reaction. This process is crucial for providing electrons to Photosystem II and releasing oxygen.

Step 2: Locate the Site and Key Component○ Expand

Photolysis of water occurs in the oxygen-evolving complex (OEC) associated with Photosystem II (PSII) on the inner side of the thylakoid membrane in chloroplasts.

Step 3: Identify the Required Micronutrient○ Expand

Manganese (Mn) is an essential micronutrient that acts as a cofactor in the oxygen-evolving complex. It plays a critical role in the catalytic cycle of water splitting, facilitating the release of electrons, protons, and molecular oxygen.

💡 Teacher's Secret Hint

Remember that other micronutrients like copper and magnesium have different, though equally important, roles in photosynthesis.

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