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  4. 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 we assume that yellowing of leaves appeared first in:

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Q. 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 we assume that yellowing of leaves appeared first in:

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Solution:

These morphological changes are indicative of certain element deficiencies and are called deficiency symptoms.
The parts of the plants that show the deficiency symptoms also depend on the mobility of the element in the plant. For elements that are actively mobilised within the plants and exported to young developing tissues, the deficiency symptoms tend to appear first in the older tissues. For example, the deficiency symptoms of nitrogen, potassium and magnesium are visible first in the senescent leaves.
Chlorosis is the appearance of yellow colour due to the non-synthesis or destruction of chlorophyll. It is caused due to deficiency of Mg, N, Fe, Ca, and S. If chlorosis occurs due to deficiency of nitrogen then the first older leaves become yellow.