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IB Biology HL B3.2.17 Hl Root Pressure Generation Questions

Explore how endodermal mineral-ion transport makes xylem sap hypertonic and generates positive root pressure that moves water upward when transpiration is low in IB Biology HL…

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how active mineral-ion uptake into root cells and xylem makes the xylem sap hypertonic so water enters by osmosis.
  • Relate osmotic water entry to positive root pressure that pushes water upward through xylem when transpiration is low or humidity is high.

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Study B3.2.17 (HL)—Root pressure generation conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL B3.2.17 Hl Root Pressure Generation Questions question 1

[Maximum number: 2]

(a) Explain how the pressure potential and solute potential change inside a plant root cell when it is placed into a solution that is more hypotonic than the cell's cytoplasm.

The photograph shows a seedling (young plant) of the family Fabaceae. The shoot and roots have been labelled.

Figure for Question IB Biology HL B3.2.17 Hl Root Pressure Generation Questions question 1 — IB Biology HL

Explain how root pressure is generated to cause movement of water through seedlings.

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