IB Biology HL B3.2.7 Water Transport in Plants Questions

Explore how leaf evaporation generates tension, cohesive water columns and wall adhesion to transport water through xylem from roots to leaves in IB Biology HL B3.2.7.

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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.

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Study B3.2.7—Water transport in plants conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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The rate of transpiration can be measured using a data-logging pressure sensor connected to a plant cutting via a plastic tube. In an experiment, a control set-up was connected to the tube and placed in a well-lit room with normal humidity levels.

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

Predict, with a reason, what will happen to the pressure in this tube as transpiration occurs.

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