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(A) The deficiency symptoms of elements that are actively mobilized within the plants appear first in the older tissues. When an element is actively m

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Actively mobilized

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(A) The deficiency symptoms of elements that are actively mobilized within the plants appear first in the older tissues. When an element is actively mobilized,the plant transports it from older,mature leaves to younger,developing leaves to support their growth. As a result,the older leaves become deficient in that specific element,and symptoms manifest there first. Examples of such mobile elements include nitrogen,potassium,and magnesium.

It is observed that the deficiency of a particular element shows its symptoms initially in older leaves and then in younger leaves. Does it indicate that the element is actively mobilized or relatively immobile?

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