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IB Biology SL B3.2.7 Water Transport in Plants Questions

Explore how evaporation creates xylem tension and how cohesion and adhesion maintain a continuous transpiration stream from roots to leaves in IB Biology SL B3.2.7.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain how evaporation from leaf mesophyll and stomata creates tension or negative pressure that draws water upward through xylem.
  • Explain how hydrogen-bond cohesion transmits tension through an unbroken xylem water column and adhesion to xylem walls helps resist gravity and maintain the stream.
  • Trace water from soil and roots into xylem and leaves, using transpiration-pull, xylem and pressure evidence to interpret transport.

IB Biology SL B3.2.7 Water Transport in Plants Questions question 1

[Maximum number: 3]

Plants require water that is carried through xylem vessels.

Figure for Question IB Biology SL B3.2.7 Water Transport in Plants Questions question 1 — IB Biology SL

Explain how transpiration causes the movement of water in plants.

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