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Correct option is B, Older leaves. In MINERAL Transport problems like this, the accurate statement is Older leaves; the others are common mix-ups. Not these: A) Young leaves; C) Roots; D) Flowers. Tissue transport questions usually turn on xylem vs phloem, living vs dead cells, or source vs sink.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.
Go with B — Interveinal chlorosis of young leaves. Under MINERAL Transport, this is the standard explanation you’d use in class: it names the real driver or definition, while the rest are nearby but wrong. Not these: A) Uniform chlorosis; C) Necrosis of old leaves; D) Leaf curling. When two options sound similar, choose the one that matches the textbook definition most tightly.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.
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