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B
Zn
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C
Cr
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D
B
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Solution
The correct option is D Cr Among all the given options Cu, Zn and B are the micronutrients required by the plants in very less quantities ( less than 0.1 gm/mg of dry weight of plants). Cr is not required by the plants either as a micronutrient ar macronutrient (required by plants in large quantity).