Essential elements are:

  • A
    Only micronutrients
  • B
    Only macronutrients
  • C
    $C, H, O$ & $N$ only
  • D
    Both macro and micronutrients

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Essential mineral elements are . . . . . . .

With reference to soil,what does the term 'critical element' mean?

Which of the following is $NOT$ a criterion for essential elements?

$A$ macronutrient which is a component of all organic compounds but is not a mineral element is

Who proposed the criteria for the essentiality of mineral elements?

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