Question

Which element is not considered as macronutrient?

• A. Mg
• B. Ca
• C. Mn
• D. P

Answer 1

The correct option is C Mn

The plant ash reveals the presence of 40 elements but all are not essential for plant nutrition, only a few are essential for growth and development of plants. These are called as essential elements.

The essential elements may be grouped as major elements or macronutrients and trace elements or micronutrients, based on their requirement by plants.

Major elements or macronutrients elements are required in large amounts and form the plant consituents. These include carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium and sulphur.

Elements like iron, boron, managanese, copper, zinc and molybdenum are required for plants only in very small amounts but these are indispensable for the normal growth and development of plants.