Which of the following elements has not been | vedclass

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(B) The criteria for essentiality of an element in plants were proposed by Arnon and Stout $(1939)$.According to these criteria,an element is essentia

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Sodium

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(B) The criteria for essentiality of an element in plants were proposed by Arnon and Stout $(1939)$.According to these criteria,an element is essential if it is required for the plant to complete its life cycle,its requirement is specific,and it is directly involved in the metabolism of the plant.Potassium $(K)$,Zinc $(Zn)$,and Iron $(Fe)$ are well-established essential macronutrients or micronutrients for plants.Sodium $(Na)$ is considered essential for some animals and some specific halophytic plants,but it is not considered an essential element for the growth and development of general higher plants.

Which of the following elements has not been proven to be essential in plants?

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