Unlike Nitrogen and Phosphorus, Potassium (K) does not become a structural component of organic molecules in plants. What is its primary biochemical role?

Options:

• A: It serves as a direct catalyst for the photolysis of water during photosynthesis.
• B: It forms the central metal atom of the chlorophyll coordination complex.
• C: It is stored as starch in the amyloplasts to provide structural rigidity.
• D: It acts as an osmoregulator, enzyme activator, and maintains ionic balance across membranes.

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