Mention the criteria of essentiality of elements ?
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Three Criteria for Essentiality of Nutrients:
A plant cannot complete its life-cycle in the absence of the element
The action of the element must be specific, with no other element being able to completely substitute for it
The element must be shown to be directly involved in the nutrition of the plant. It must be a constituent of a metabolic pathway or at least be required for the activity of an essential enzyme
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the elements are those which are made up of any one singal atom
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