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Which of the following elements is a macronutrient?

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in Biology – Class 11 by (272k points)
Which of the following elements is a macronutrient?

(a) Cu

(b) Mn

(c) Cl

(d) Mg

I have been asked this question at a job interview.

My doubt stems from Mineral Requirements of a Plant-2 in chapter Mineral Nutrition of Biology – Class 11

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The correct choice is (d) Mg

For explanation I would say: Mg is a macronutrient. Macronutrients consist of elements which are necessary for plant’s survival and are required in excess of 10 mmole Kg^-1. Mg is absorbed by plants in divalent form. It is involved in the synthesis of DNA & RNA. Cu, Mn and Cl are micronutrients.

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