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For plant growth and development, nutrients are very much necessary. Based on their requirements nutrients can be two types; macronutrients and micronutrients. Macronutrients include carbon, phosphorus, hydrogen, nitrogen, oxygen, and some more elements. Macronutrients and micronutrients constitutively form biomolecules.

The micronutrients are named so because these are required in very less amounts, and the elements are present in very trace amounts. These include boron, manganese, chlorine, iron, copper, zinc, nickel, molybdenum, silicon, and sodium. Although these are present in very small qualities, they are necessary for all kinds of enzymatic activities.

Macronutrients are required by plants for some vital works such as protein synthesis and energy metabolism.

Various macronutrients and micronutrients constitutively form biomolecules that are essential for the normal growth of plants.

Phosphorous, nitrogen, and potassium are major nutrients among all other essential nutrients that are required for plant growth.

Therefore, the correct answer is option ‘a’.

Micronutrients are necessary for the functions of enzymes.