The deficiency of molybdenum induces

Absence of $Mg^{++}$ ions from plant tissue results in

Premature leaf fall is due to deficiency of

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 deficiencies would show such symptoms?

All of the following are elements whose deficiency symptoms first appear in the older tissues,except:

In plants,the root system is well-developed due to: