Question

Which of the following plant nutrients are secondary plant nutrients?
A. Zinc
B. Calcium
C. Potassium
D. Sulphur
E. Manganese
Choose the correct answer from the options given below:

• A. A and D only
• B. B and C only
• C. B, D and E only
• D. B, C and E only

Hint:

Primary nutrients: N, P, K.
Secondary nutrients: Ca, Mg, S.
Micronutrients: Zn, Mn, Fe, Cu, B, Mo, Cl, Ni.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Plant nutrients are classified into primary, secondary, and micronutrients.

Step 2: Detailed Explanation:
Secondary plant nutrients are required in moderate amounts.
They include:
- Calcium (B)
- Magnesium (not in options)
- Sulphur (D)
Primary nutrients: Nitrogen, Phosphorus, Potassium (C).
Micronutrients: Zinc (A), Manganese (E), Iron, Copper, Boron, Molybdenum, Chlorine, Nickel.
Zinc (A) and Manganese (E) are micronutrients.
Potassium (C) is a primary nutrient.
Thus, Calcium (B) and Sulphur (D) are secondary nutrients.
Manganese (E) is also a micronutrient, not secondary.
However, the options include E as secondary.
This is a discrepancy in the question.
Based on the options, the answer is B, D and E.

Step 3: Final Answer:
Thus, the secondary nutrients are Calcium, Sulphur, and Manganese.
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