Match List-I with List-II:

List-I (Mineral Element)	List-II (Function)
[A] Molybdenum	(I) Water oxidation
[B] Manganese	(II) Chlorophyll structure
[C] Magnesium	(III) Nitrogen fixation
[D] Zinc	(IV) Auxin synthesis

Choose the correct answer from the options given below:

Correct option is B

✅ Correct matching: Option (b)
[A]-(III), [B]-(I), [C]-(II), [D]-(IV)
Explanation of correct pairs:
· Molybdenum → Nitrogen fixation (III)
· Essential component of nitrogenase and nitrate reductase enzymes.
· Plays a key role in biological nitrogen fixation.
· Manganese → Water oxidation (I)
· Integral part of the oxygen-evolving complex in photosystem II.
· Helps in splitting water molecules during photosynthesis.
· Magnesium → Chlorophyll structure (II)
· Central atom of the chlorophyll molecule.
· Essential for photosynthesis.
· Zinc → Auxin synthesis (IV)
· Required for synthesis of tryptophan, a precursor of auxin (IAA).
· Influences growth and elongation.
➡️ Hence, option (b) is the correct answer.
❌ Why other options are incorrect
Option (1):
· Incorrect association of magnesium with nitrogen fixation.
Option (3):
· Zinc is not directly involved in nitrogen fixation.
Option (4):
· Magnesium does not function in water oxidation.
�� Key Points to Remember
· Mo → Nitrogen fixation
· Mn → Water splitting in photosynthesis
· Mg → Central atom of chlorophyll
· Zn → Auxin synthesis