Mass flow is observed during the transport of substances through
A. Parenchyma cells
B. Vessels
C. Meristematic cells
D. Sieve tubes

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both C and D

both A and B

both A and C

both B and D

answer is D.

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Detailed Solution

Vessels and sieve tubes are the main conduits of xylem and phloem respectively. They are involved in mass flow of substances under pressure gradient irrespective of the concentration of various solutes in solution or suspension. This movement is called as translocation.

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