A trace element essential for plant growth and a radioactive isotope which is used in cancer therapy is

Calcium

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Iron

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Cobalt

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Sodium

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Solution

The correct option is B Cobalt
Calcium, Iron and Sodium are not trace elements but macronutrients and required in large quantities.
Cobalt is a trace element but essential for plant growth because it helps in cell division and nitrogen fixation.
It is also used in cancer therapy.
So the correct answer is 'Cobalt'.

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