Deficiency symptoms of an element tend to appear first in young leaves. It indicates that the element is relatively immobile. Which one of the following elemental deficiency would show such symptoms?
(a) Sulphur
(b) Magnesium
(c) Nitrogen
(d) Potassium
Ans. The answer is the option (a) Sulphur
Explanation: Elements other than Sulphur are highly mobile and they move from old leaves to the young.