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 B3.2.17.

Exam points

Explain how endodermal ion pumping lowers xylem water potential so water enters by osmosis.
Link positive root pressure to upward xylem flow when transpiration is low, such as in humid conditions.

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