Question

Identify the correct set of elements whose deficiency first occurs in older leaves.

• A. N, S, Ca
• B. N, Ca, Mg
• C. Mg, S, Ca
• D. N, K, Mg

Answer 1

The correct option is D

N, K, Mg

The correct option is D.

Explanation for the correct option:

1. The order in which symptoms of mineral deficiency in plants appear is determined by the mobility of elements in plants.
2. In the case of elements that are easily mobilized and transported to young growing tissues, an element deficiency appears first in older tissues.
3. Nitrogen (N), potassium (K), and magnesium are examples of such elements (Mg).

Explanation for the incorrect options:

1. In young growing tissues, there is a deficiency of relatively immobile elements.
2. Sulphur (S) and calcium (Ca) are two examples of such elements.

Final answer: N, K, and Mg are the elements whose deficiency first occurs in older leaves.