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(D) Essential elements are grouped into four broad categories based on their functions:$(i)$ Elements that act as components of biomolecules and are s

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All except $II$

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(D) Essential elements are grouped into four broad categories based on their functions:$(i)$ Elements that act as components of biomolecules and are structural elements of cells: Carbon,Hydrogen,Oxygen,and Nitrogen.$(ii)$ Elements that are components of energy-related chemical compounds in plants: Magnesium (in chlorophyll) and Phosphorus (in $ATP$).$(iii)$ Elements that activate or inhibit enzymes: e.g.,Magnesium $(Mg^{2+})$ for RuBisCO and PEPCase.$(iv)$ Elements that alter the osmotic potential of a cell: e.g.,Potassium $(K^+)$.Since Hydrogen $(I)$,Oxygen $(III)$,and Nitrogen $(IV)$ are structural components of biomolecules,while Magnesium $(II)$ is primarily associated with energy-related compounds and enzyme activation,the correct answer is $I, III,$ and $IV$. However,looking at the provided options,the most accurate choice that includes the primary structural elements is $D$ (All except $II$).

Identify the elements which function as components of biomolecules.
$I.$ Hydrogen
$II.$ Magnesium
$III.$ Oxygen
$IV.$ Nitrogen

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Identify the elements which function as components of biomolecules.$I.$ Hydrogen$II.$ Magnesium$III.$ Oxygen$IV.$ Nitrogen