A) Boron
B) Nickel and cadmium
C) Molybdenum
D) Zinc
Correct Answer: B
Solution :
Nickel and Cadmium are not included in essential micro nutrient. They are not required for healthy growth of plant. Boron is essential micronutrient which is required for calcium metabolism, pollen germination, cell differentiation, carbohydrate transport, root nodulation etc. Molybdenum acts as activator of certain enzymes involved in nitrogen metabolism including nitrate reduction and nitrogen fixation, ascorbic acid synthesis, oxidation reduction reaction. Zinc is involved in synthesis of growth hormone auxin (IAA) and acts as activator of certain carboxylases and dehydrogenases.
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