Lesson 3.1.2a

3.1.2a Need for transport and circulatory systems Quiz: OCR Biology, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.1.2a, Need for transport and circulatory systems: 20 multiple choice questions for the OCR Biology (H020), Unit 2: Exchange and transport, written with Revision Ninja.

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The 20 questions

  1. Why do large multicellular animals require a specialised transport system?

    • Large SA:V ratio
    • High surface area
    • Small SA:V ratio
    • Short diffusion distance

  2. Which factor increases an organism's need for a specialised transport system?

    • High SA:V ratio
    • Short diffusion distance
    • High metabolic rate
    • Low activity level

  3. What do circulatory systems transport between exchange surfaces and body cells?

    • Carbon dioxide only
    • Antibodies only
    • Nutrients and oxygen
    • Enzymes and DNA

  4. What transport fluid directly bathes body tissues in an open circulatory system?

    • Lymph
    • Blood
    • Haemolymph
    • Tissue fluid

  5. Which feature is characteristic of a closed circulatory system?

    • High blood pressure
    • Direct tissue bathing
    • Low flow rate
    • Open body cavities

  6. How many times does blood pass through the heart in one complete circuit of a single system?

    • Three times
    • Twice
    • Four times
    • Once

  7. How many times does blood pass through the heart per complete circuit in a double system?

    • Four times
    • Once
    • Three times
    • Twice

  8. Where does blood lose pressure in a fish's single circulatory system before reaching body tissues?

    • Heart atrium
    • Gill capillaries
    • Systemic veins
    • Ventricle

  9. Which heart chamber pumps blood at high pressure into the systemic circuit?

    • Left ventricle
    • Right atrium
    • Left atrium
    • Right ventricle

  10. Which organism has the lowest surface area to volume ratio?

    • A bacterium
    • An amoeba
    • A whale
    • A shrew

  11. Compared to insects, why do mammals require a more efficient circulatory system?

    • Larger SA:V ratio
    • Higher metabolic rate
    • Lower metabolic rate
    • Smaller body size

  12. A cube is scaled from side 4 cm. What is its surface area to volume ratio?

    • 2:1
    • 1:1.5
    • 6:1
    • 1.5:1

  13. How is oxygen mainly delivered to body tissues in insects?

    • Tracheal system
    • Haemolymph
    • Blood vessels
    • Haemoglobin

  14. Why can single-celled organisms rely solely on diffusion for gas exchange?

    • Large SA:V ratio
    • High metabolic demand
    • Small SA:V ratio
    • Long diffusion path

  15. What type of circulatory system do insects possess compared to mammals?

    • Open system
    • Single system
    • Closed system
    • Double system

  16. What primary physical limitation drove the evolution of circulatory systems in larger animals?

    • Low cell count
    • Thin membranes
    • High blood volume
    • Slow diffusion rate

  17. What advantage of double circulation helps maintain a high metabolic rate in mammals?

    • High blood viscosity
    • High systemic pressure
    • Slow blood flow
    • Low pulmonary pressure

  18. A 2 cm cube has SA:V of 3:1 and a 1 cm cube has 6:1. By what factor does SA:V change when size doubles?

    • 0.5
    • 0.25
    • 4
    • 2

  19. Why do single-celled organisms not require a specialised transport system?

    • High SA:V ratio
    • Low SA:V ratio
    • Impermeable cell membrane
    • High metabolic rate

  20. How does a larger body size affect an animal's surface area to volume ratio?

    • Has no effect
    • Decreases the ratio
    • Increases the ratio
    • Doubles the ratio

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