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Which one of the following is not a micronutrient?
A
Boron
B
Molybdenum
C
Magnesium
D
Zinc
Detailed Solution
Macronutrients are needed in large amounts (more than 10 mmole per kg of dry matter): C, H, O, N, P, K, S, Ca and Mg.
Micronutrients or trace elements are needed in very small amounts (less than 10 mmole per kg of dry matter): Fe, Mn, Cu, Mo, Zn, B, Cl and Ni.
Boron, molybdenum and zinc are micronutrients.
Magnesium is a macronutrient; it is a constituent of the ring structure of chlorophyll and activates enzymes of respiration and photosynthesis.
Hence magnesium is not a micronutrient.
Micronutrients or trace elements are needed in very small amounts (less than 10 mmole per kg of dry matter): Fe, Mn, Cu, Mo, Zn, B, Cl and Ni.
Boron, molybdenum and zinc are micronutrients.
Magnesium is a macronutrient; it is a constituent of the ring structure of chlorophyll and activates enzymes of respiration and photosynthesis.
Hence magnesium is not a micronutrient.