NEET Biology question

Not in NEET syllabus

Transport of organic solutes is supposed to take place by the pressure flow hypothesis through phloem tissue from source to sink. Choose the false statement about vascular tissue transport.

(A)Phloem transports mainly water and sucrose, but other sugars, hormones and amino acids are also transported
(B)Water enters into the sieve tube by the process of osmosis
(C)Water and solute move through the sieve tube along the pressure gradient
(D)Sieve tubes in the source have a low turgor pressure (pressure potential)Correct

Answer: (D)

Solution

Statements (a), (b) and (c) correctly describe phloem transport. Statement (d) is false — because sugar is actively loaded into sieve tubes at the source, water enters by

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Question ID VK-127812