A) The minerals, particularly \[C{{a}^{2+}},\,\,{{K}^{+}}\,and\,\,N{{a}^{+}}\] maintain the permeability of cytomembranes
B) Minerals like Cu, As, impart toxic effect on the proplasm under specific condition
C) Several elements particularly Fe, Ca, Mg, Zn, Cu, Cl act as metallic catalyst in biochemical reactions
D) Mg, K and Ca are essential microelements
Correct Answer: D
Solution :
Mg, K and Ca are essential macro elements. Macronutrients are required by plants in larger amounts.
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