Which of the following is not a criterion for the essentiality of an element?

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Requirement of the element is specific

Necessary for normal growth and reproduction

Not replaceable by another element

Indirectly involved in plant metabolism

answer is D.

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Detailed Solution

Arnon and Stout (1939) proposed the criteria for knowing the essentiality of an element. They are:
(i) It is indispensable for the growth of plants.
(ii) The element is directly involved in the metabolism of plants.
(iii) A plant is unable to complete its vegetative or reproductive phase in the absence of the element.
(iv) The element cannot be replaced by any other element.

(v) The absence or deficiency of the element produces disorders. These disorders are a direct result of the lack/ deficiency of the element.

Hence, option D is the correct answer.

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