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Which one of the following is NOT a criteria for an element to be called as essential?

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Which one of the following is NOT a criteria for an element to be called as essential?

(a) These elements need not to take part in growth and development

(b) The function of an element must not be replaceable

(c) The element should be involved in plant metabolism

(d) A plant cannot complete its life cycle without these elements

The question was posed to me in final exam.

This intriguing question originated from Mineral Nutrition in division Plant Physiology of Life Sciences

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Correct option is (a) These elements need not to take part in growth and development

For explanation I would say: Essential elements have a specific physiological role in the growth and development of plants.

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