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Learning objective

Relate multicellularity to mass transport systems.

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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

Relate multicellularity to mass transport systems

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

Key concepts

relatetransportmasssystemsmulticellularity

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 best explains why multicellular organisms require mass transport systems?

Direct answer

Multicellular organisms have a low surface area to volume ratio, necessitating mass transport systems to efficiently distribute substances.

Key terms

  • Mass transport system: A system that facilitates the movement of substances throughout an organism, such as the circulatory system in animals or the vascular system in plants.
  • Surface area to volume ratio: A measure of the amount of surface area per unit volume of an object, which affects the rate of diffusion and heat exchange.

Common trap

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

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