Which of the following is a criteria for essentiality of an element in plants ?

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The element must be absolutely necessary for supporting normal growth and reproduction

The deficiency of any one element can be met by supplying some other element

The element must be indirectly involved in the metabolism of plants

The element must be absolutely necessary for supporting normal growth , but not necessary for reproduction

answer is A.

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Detailed Solution

According to Arnon the criteria for essentiality of an element are 1 - the element must be absolutely necessary for supporting the normal growth and reproduction. 2 - the requirement of the element must be specific and not replaceable by any other element 3- the element must be directly involved in the metabolism of the plant

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