NEET Biology question

Not in NEET syllabus

Why is the transport of organic food through phloem bidirectional?

(A)Roots serve as source while leaves are the sink region
(B)Source and sink regions are irreversible
(C)The relationship between the two regions (source and sink) is variable and is dependent on season and plant needsCorrect
(D)Translocation of organic solute is regulated by energy

Answer: (C)

Solution

Unlike xylem, where roots are always the source of water, in phloem the identity of "source" (net exporter of sugar) and "sink" (net importer) is not fixed — leaves are usually sources, but storage organs like roots or tubers can act

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Question ID VK-127808