Single correct option
Chlorophyll, the green pigment of plants, contains which metal at the centre of its molecule?
- A. Magnesium
- B. Iron
- C. Calcium
- D. Copper
Show answer and solution
Answer: (A) Magnesium
The porphyrin ring of chlorophyll holds a magnesium ion at its centre, so magnesium deficiency causes yellowing of leaves. Iron occupies the centre of haem in haemoglobin, which is the common confusion. Calcium and copper are not part of the chlorophyll molecule.
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