Question

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

• A. Old leaves
• B. Young leaves
• C. Young leaves followed by mature leaves
• D. Mature leaves followed by young leaves

Answer 1

Answer: (A)

Old leaves

• On the basis of the symptoms of chlorosis in the leaves, a student inferred that this was due to the deficiency of nitrogen.
• This may be correct inference only if yellowing of leaves appeared first in young leaves then in old leaves. But Chlorosis is the main symptom of nitrogen deficiency.
• Therefore, the leaves gradually become pale or yellow. These will first appear in old leaves and then in young leaves.
• The correct option is A.