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In which of the following, all three are macronutrients?

1. (a) Boron, zinc, manganese
2. (b) Iron, copper, molybdenum
3. (c) Molybdenum, magnesium, manganese
4. (d) Nitrogen, calcium, phosphorus

Correct answer: (d) Nitrogen, calcium, phosphorus

Solution

Nitrogen, calcium, and phosphorus are all required by plants in relatively large quantities, so they are macronutrients. The other choices list elements that are mainly micronutrients and needed only in trace amounts.

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