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Learning objective

Explain why size affects exchange requirements.

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Topic

Exchange substances official content

Subtopic

Surface area to volume ratio

Aqa A Level BiologyOrganisms exchange substances with their environment

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Quick explanation

Explain why size affects exchange requirements

  • This point belongs to Exchange substances official content, especially Surface area to volume ratio.
  • You need to be able to explain why size affects exchange requirements.
  • The key ideas to know are exchange.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

exchange

Why it matters

This objective helps connect Surface area to volume ratio to exam-style questions, flashcards, and revision notes for Exchange substances official content.

Quick student answer

Which of the following statements best explains why larger organisms have a greater need for specialized exchange surfaces?

Direct answer

Larger organisms have a smaller surface area to volume ratio, which limits the efficiency of diffusion for exchanging substances.

Key terms

  • Exchange surfaces: Specialized structures that facilitate the transfer of substances between an organism and its environment, such as lungs or gills.
  • Adaptations: Features that enhance an organism's ability to exchange substances, such as increased surface area or thin membranes.

Common trap

Confusing surface area with volume: Remember that as size increases, volume increases faster than surface area, leading to a lower surface area to volume ratio.

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