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Deficiency symptoms of nitrogen and potassium are visible first in

(a) senescent leaves

(b) young leaves

(c) roots

(d) buds.
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Ans : (a) senescent leaves

Explanation:

Deficiency symptoms appear first in young leaves and young tissues in case of elements which are relatively immobile inside the plant e.g., Ca, S. For mobile elements like N and K, deficiency symptoms first appear in old and senescent leaves ns the elements are mobilised from senescing regions for supply to young tissues.

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