CAIE A-Level Biology AS 7.2.8 Mass Flow in Phloem Questions
Explain pressure-driven mass flow in phloem using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- AS
Exam points
- Explain mass flow in phloem and the pressure gradients that drive assimilate movement.
CAIE A-Level Biology AS 7.2.8 Mass Flow in Phloem Questions question 1
[Maximum number: 1]
Which conditions are needed to allow the mass flow of sucrose in phloem sieve tubes?
phloem sieve tube in sources
phloem sieve tube in sinks
higher hydrostatic pressure higher water potential
lower hydrostatic pressure lower water potential
higher hydrostatic pressure lower water potential
lower hydrostatic pressure higher water potential
lower hydrostatic pressure higher water potential
higher hydrostatic pressure lower water potential
lower hydrostatic pressure lower water potential
higher hydrostatic pressure higher water potential
B
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