A-LevelBiologyTransport in plants9700/12 · May/June 2022 · Q291 Mark
Which row shows the correct sequence for the movement of sucrose into phloem sieve tubes?
Adiffusion of sucrose into the
companion cell cytoplasm
active transport of protons
into the companion
cell cytoplasm
cotransport of protons and
sucrose into the sieve tubes
Bcotransport of protons and
sucrose into the companion
cell cytoplasm
active transport of protons
out of the companion
cell cytoplasm
diffusion of sucrose into
the sieve tubes
Cactive transport of protons
into the companion
cell cytoplasm
diffusion of sucrose into the
companion cell cytoplasm
cotransport of protons and
sucrose into the sieve tubes
Dactive transport of protons
out of the companion
cell cytoplasm
cotransport of protons and
sucrose into the companion
cell cytoplasm
diffusion of sucrose into
the sieve tubes
✓ Correct answer
D: active transport of protons out of the companion cell cytoplasm cotransport of protons and sucrose into the companion cell cytoplasm diffusion of sucrose into the sieve tubes
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