Question

what are macronutrients and why are they called macronutrients​

Answer 1

The nutrients are mainly absorbed by the roots along with water from the soil. Some of them are required in large quantities so they are called macronutrients. Some others are needed in required quantities so the are called micronutrients.
examples of macronutrients:
Nitrogen, Magnesium, Phosphorus, Potassium.
examples of micronutrients:
Iron, Maganese, zinc.

Answer 2

Those that are needed in large amounts are called macronutrients. There are three macronutrients required by humans: carbohydrates , lipids and proteins.

They are called macro nutrients because they are needed by humans in large amount.

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