Multiple choice

Which of the following functions is performed by the microelements in plants?

  1. Cofactors of enzymes

  2. Building blocks of amino acids

  3. Constituent of hormones

  4. Binder of cell structure
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A Correct answer
Explanation

Microelements (micronutrients like Fe, Mn, Zn, Cu, Mo, B, Cl) primarily function as cofactors for various enzymes in plant metabolism. They are not building blocks of amino acids (that's N, S), not constituents of hormones (though some like B may influence hormone activity), and not binders of cell structure (that's Ca). Their main role is enzyme activation/cofactors.

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