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Learning objective

Identify that the energy driving diffusion originates from the kinetic energy of molecules and ions in random motion.

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  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE BiologyMovement into and out of cellsCore content

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Identify that the energy driving diffusion originates from the kinetic energy of molecules and ions in random motion

  • This point belongs to Diffusion, especially Diffusion outcomes.
  • You need to be able to identify that the energy driving diffusion originates from the kinetic energy of molecules and ions in random motion.
  • The key ideas to know are State.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

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State

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Paper 3 structured question: Diffusion

Paper 3Theory (Core)2 marks

Description

Diffusion Energy Source

Diffusion is the movement of molecules and ions from an area of higher concentration to an area of lower concentration. This movement happens naturally without any external energy input.

  1. a

    State the source of energy that drives diffusion.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Identify why diffusion does not require external energy input.

    Aim for approximately 1 distinct marking point.

    [1]
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