On the basis of symptoms of chlorosis in leav | vedclass

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(B) Chlorosis is the loss of chlorophyll leading to the yellowing of leaves,which is a primary symptom of nitrogen deficiency. Nitrogen is a mobile el

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Old leaves

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(B) Chlorosis is the loss of chlorophyll leading to the yellowing of leaves,which is a primary symptom of nitrogen deficiency. Nitrogen is a mobile element within the plant. When nitrogen is deficient,the plant translocates nitrogen from older tissues to younger,actively growing tissues to support their development. Consequently,the deficiency symptoms,such as yellowing,first manifest in the older leaves before spreading to the younger ones.

On the basis of symptoms of chlorosis in leaves,a student inferred that this was due to the deficiency of nitrogen. This inference could be correct only if yellowing of leaves appeared first in

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