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Minerals known to be required in large amounts for plant growth include

(a) potassium, phosphorus, selenium, boron

(b) magnesium, sulphur, iron, zinc

(c) phosphorus, potassium, sulphur, calcium

(d) calcium, magnesium, manganese, copper.

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Ans : (c) phosphorus, potassium, sulphur, calcium.


Macroelements (macronutrients) are those essential elements which are present in easily detectable quantities, i.e., 1-10 mg per gram of dry matter. Macroelements are usually involved in the synthesis of ! organic molecules and development of osmotic potential. They are nine in number ' C, H, O, N, P, K, S, Mg and Ca.

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