IBBiologyHLExam QuestionsContinuity & ChangeWater Potential

Syllabus Edition

First teaching 2023

First exams 2025

|

Water Potential (HL IB Biology)

Exam Questions

22 mins6 questions

Select a question set to download for
Water Potential

Select an answer set to view for
Water Potential

Medium
Hard
11 mark

The diagram below shows red blood cells that have been bathed in solutions of different solute concentration.

q2-1-3-cell-membrane-medium-ib-hl-biology

Which row of the table correctly describes the three solutions that these red blood cells have been bathed in?

  I II III
A. Isotonic Hypotonic Isotonic
B. Isotonic Hypertonic Hypotonic
C. Isotonic Hypotonic Hypertonic
D. Hypertonic Hypotonic Isotonic

    Choose your answer

    Did this page help you?

    21 mark

    A student places an animal cell and a plant cell into distilled water and notes the following observations.

           Animal cell: swells and then bursts.

          Plant cell: swells.

    What is the reason for this difference?

    • Plant cell surface membranes are partially permeable

    • Animal cells have no vacuole

    • Animal cells have no cell wall

    • Plant cell walls are freely permeable

    Choose your answer

    Did this page help you?

    1
    Sme Calculator    1 mark

    An experiment to calculate the water potential of potato cells was performed using the following protocol:

    1. Dice potato into 1cm3 cubes.
    2. Add potato cubes to 6 test tubes, each containing solution with a different sucrose concentration.
    3. Wait 12 hours.
    4. Weigh the cubes from each test tube and plot a graph. 

    The mean mass of the potato cubes was 2.50 g before being added to the solution, and the graph shows the masses of the potato cubes after the experiment. 1-3-h-q4-paper-1

    Which concentration of sucrose matches the water potential of the potato cells?

    • 0.00 mol dm-3

    • 0.12 mol dm-3

    • 0.31 mol dm-3

    • 0.66 mol dm-3

    Choose your answer

    Did this page help you?