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What do you mean by the term “Trace elements”?

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What do you mean by the term “Trace elements”?

(a) Needed in small amount

(b) Needed at medium amount

(c) Needed at very high amount

(d) The elements which are discovered

The question was posed to me in final exam.

Origin of the question is Medium Optimization topic in chapter Introduction to Fermentation Processes & Media for Industrial Fermentation of Bioprocess Engineering

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Right answer is (a) Needed in small amount

To explain: A chemical element required only in minute amounts by living organisms for normal growth.

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