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B
Mg
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C
Ca
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D
Mn
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Solution
The correct option is B Mg Magnesium is an essential macronutrient for plants. It is required for activity of many enzymes, specially kinase enzymes. It is also an important component of chlorophyll.
Chlorophylls have a porphyrin head and a phytol tail. The porphyrin head is cyclic tetrapyrrole structure with magnesium present in the centre of head. Deficiency of magnesium produces chlorosis in plants, due to lack of chlorophyll formation. If chlorophyll is burnt the inorganic part, i.e., magnesium will be left over.