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Question

Deficiency symptoms of nitrogen and potassium are visible first in

A
young leaves
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B
roots
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C
buds
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D
senescent leaves
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Solution

The correct option is D senescent leaves

Elements are of two types. Mobile and immobile.
Mobile elements- Nitrogen, potassium and magnesium.
The deficiency symptoms of mobile elements are visible first in the senescent (older) leaves. In the older leaves, biomolecules containing these elements are broken down, making these elements available to younger leaves during deficiency.

The deficiency of immonile elements such as calcium first appears in the young leaves as they are not transported out of older leaves.

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