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.

Exam points

Explain how evaporation from leaf mesophyll creates tension that pulls water up through xylem.
Explain how hydrogen-bond cohesion keeps the xylem water column continuous under tension.
Explain how adhesion to xylem walls helps water move upward against gravity.
Trace water movement from roots to leaves through xylem as a continuous transpiration stream.

[Maximum number: 2]

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