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Cambridge IGCSE Biology practice

Paper 4 structured question: Osmosis

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Osmosis

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Paper 4Theory (Extended)3 marks

A plant cell is placed in a concentrated salt solution and observed over time.

Description

Plant Cell in Concentrated Salt Solution

A plant cell is placed in a concentrated salt solution. After some time, the cell membrane is observed to have pulled away from the cell wall.

  1. a

    Identify the process occurring when the cell membrane pulls away from the cell wall.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Explain why the plant cell becomes flaccid in the concentrated salt solution.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 4 structured question: Osmosis

Paper 4Theory (Extended)2 marks

Description

Plant Cells in Sugar Solutions

The student places plant cells in three different sugar solutions: pure water (0% sugar), 5% sugar solution, and 20% sugar solution. After 30 minutes, the student observes the cells under a microscope and notes their condition.

SolutionCell Condition
0% sugarTurgid
5% sugarNormal
20% sugarPlasmolysed
  1. a

    Explain why the plant cells become turgid in pure water.

    Aim for approximately 2 distinct marking points.

    [2]