Question

If deficiency symptoms of element 'A' appear first in older tissues and of element 'B' appear first in younger tissues, then choose the correct one from the following regarding these elements.

• A. $A=Nitrogen;B=Magnesium$
• B. $A=Calcium.B=Sulphur$
• C. $A=Sulphur,B=Potassium$
• D. $A=Magnesium,B=Calcium$

Answer 1

The correct option is D $A=Magnesium,B=Calcium$

Mineral elements whose symptoms first appear in old leaves or tissues, then younger leaves or tissues are called Mobile elements. eg: N, K, P, Cl, Zn, Mo, Ni, Mg. Mineral elements, whose symptoms first appear in younger leaves or tissues are called Immobile elements. eg: Ca, S, Fe, B, Cu.

So, the correct option is ‘A=Magnesium and B=Calcium’.