Assertion (A): The deficiency symptoms of N, P and Mg are visible first in senescent leaves.
Reason (R): Elements like N, P and Mg are mobile.

Q. Assertion (A): The deficiency symptoms of N, P and Mg are visible first in senescent leaves.
Reason (R): Elements like N, P and Mg are mobile.

Q. Select the correct option-
Assertion: When there is a deficiency of relatively mobile elements, the deficiency symptoms appear first in young tissues.
Reason: Relatively mobile elements like nitrogen, phosphorus etc are transported from young tissues to old senescing tissues

Q. Assertion (A): The symptoms of manganese toxicity are actually the deficiency symptoms of Fe, Mg and Ca.
Reason (R): Mn competes with Fe and Mg for uptake and also inhibits Ca translocation in the shoot apex.

Q. Assertion : Deficiency symptoms of NPK first appear on old plant parts.
Reason: NPK are mobile elements so they transport from old parts to young parts.

Q. It is observed that deficiency of a particular element showed its symptoms initially in older leaves and then in younger leaves.

a. Does it indicate the element is actively mobilized or relatively immobile?

b. Name two elements which are highly mobile and two which are relatively immobile. c. How is the aspect of mobility of elements important to horticulture and agriculture?