A-LevelBiologyTransport in plants9700/12 · Feb/Mar 2024 · Q311 Mark
Which conditions are needed to allow the mass flow of sucrose in phloem sieve tubes?
Aphloem sieve tube in sources: higher hydrostatic pressure, higher water potential; phloem sieve tube in sinks: lower hydrostatic pressure, lower water potential
Bphloem sieve tube in sources: higher hydrostatic pressure, lower water potential; phloem sieve tube in sinks: lower hydrostatic pressure, higher water potential
Cphloem sieve tube in sources: lower hydrostatic pressure, higher water potential; phloem sieve tube in sinks: higher hydrostatic pressure, lower water potential
Dphloem sieve tube in sources: lower hydrostatic pressure, lower water potential; phloem sieve tube in sinks: higher hydrostatic pressure, higher water potential
✓ Correct answer
B: phloem sieve tube in sources: higher hydrostatic pressure, lower water potential; phloem sieve tube in sinks: lower hydrostatic pressure, higher water potential
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