Q.Match the correct combination. Minerals with Role.

Each mineral has a signature biochemical role: Molybdenum → nitrogenase, Zinc → auxin synthesis, Magnesium → chlorophyll, Sulphur → sulphur-containing amino acids like methionine — giving (1)-(iv), (2)-(iii), (3)-(i), (4)-(ii).

Match each mineral to its well-known biochemical function:

(1) Molybdenum — an essential component/cofactor of the enzyme nitrogenase (used by nitrogen-fixing organisms to reduce atmospheric N2) and also of nitrate reductase → matches (iv) Nitrogenase.

(2) Zinc — required for the biosynthesis of the auxin indole-3-acetic acid (IAA), and it activates several enzymes → matches (iii) Auxin.

(3) Magnesium — is the central metal atom coordinated within the porphyrin ring of the chlorophyll molecule; without magnesium, chlorophyll cannot be formed → matches (i) Chlorophyll.

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