Question

Which one of the following is a macronutrient?

• A. Boron
• B. Zinc
• C. Copper
• D. Potassium

Answer 1

The correct option is D

Potassium

The correct option D.

Explanation of correct option:

1. Potassium is a macronutrient that is required by plants in large amounts.
2. It is needed for water and nutrient movement in plants.
3. It also helps in enhancing enzyme actions and also aids in the process of photosynthesis.
4. It aids in the translocation of organic substances such as food materials through the phloem.

Explanation of incorrect options:

Option A:

1. Boron is a micronutrient needed that is required in smaller quantities by the plants.
2. It is used for the formation of the cell wall and to maintain structural stability.

Option B:

1. Zinc is a micronutrient essential for metabolic activities and chlorophyll production.

Option C:

1. Copper is a micronutrient important for enzyme activities and lignin production.

Final answer: Potassium is a macronutrient required by plants.