A) mesophyll cells to vessels
B) vessels to mesophyll cells
C) mesophyll cells to sieve tubes
D) sieve tubes to mesophyll cells.
Correct Answer: C
Solution :
: Vein loading is the process in which sucrose present in mesophyll cells is picked up by specific carrier molecule and actively transported across the cells and loaded into the sieve tubes found in the veins. Some of the cells, found around phloem elements act like transfer cells in transporting the sucrose into sieve tubes.
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