Discussion
Match the following and choose the correct combination :
| (a) Sulphur | (1) Chlorophyll |
| (b) Zinc | (2) Nitrogenase |
| (c) Magnesium | (3) Methionine |
| (d) Molybdenum | (4) Auxin |
Answer: B
The correct combination is a - 3, b - 4, c - 1, d - 2.
- Sulphur is part of the amino acid methionine (and cysteine).
- Zinc is needed to make auxin, through tryptophan, the precursor of indole-3-acetic acid; zinc deficiency causes small leaves and stunting.
- Magnesium is the central atom of chlorophyll.
- Molybdenum is a cofactor of nitrogenase (the FeMo-cofactor), and of nitrate reductase.
Each other combination breaks one of the safest pairs. Option A gives sulphur to chlorophyll, option C gives zinc to chlorophyll, and option D gives molybdenum to methionine.
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