A-LevelBiologyTransport in plants9700/12 · May/June 2016 · Q261 Mark
Which statement about the transport of sucrose is correct?
AATP synthesised by mitochondria of companion cells provides the energy to move sucrose from phloem sieve tube elements in leaves to sinks.
BSucrose moves through plasmodesmata by passive diffusion from mesophyll cells through companion cells to phloem sieve tube elements.
CThe water potential in phloem sieve tube elements becomes more negative following the entry of sucrose.
DWater enters companion cells and hydrostatic pressure builds up to push sucrose into phloem sieve tube elements by mass flow.
✓ Correct answer
C: The water potential in phloem sieve tube elements becomes more negative following the entry of sucrose.
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