Lesson 3.3.4.2.1

3.3.4.2.1 Mass transport in plant tissues Quiz: AQA Biology, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.3.4.2.1, Mass transport in plant tissues: 20 multiple choice questions for the AQA Biology (7402), Unit 3: Organisms exchange substances with their environment, written with Revision Ninja.

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The 20 questions

  1. What main substances are transported upwards through xylem tissue in plants?

    • Water and minerals
    • Amino acids only
    • Sucrose and minerals
    • Glucose and starch

  2. Which main organic solute is transported throughout the plant by phloem tissue?

    • Starch
    • Glucose
    • Sucrose
    • Cellulose

  3. According to the cohesion-tension theory, what process generates the tension that pulls water upwards?

    • Active transport
    • Transpiration
    • Translocation
    • Root pressure

  4. What role does cohesion play between water molecules during xylem transport?

    • Increases evaporation rate
    • Maintains unbroken column
    • Provides kinetic energy
    • Prevents xylem collapse

  5. Which substance strengthens xylem cell walls to prevent them from collapsing under tension?

    • Lignin
    • Chitin
    • Suberin
    • Cellulose

  6. In the mass flow hypothesis, what causes water to enter sieve tubes at the source?

    • Higher water potential
    • Lower water potential
    • Evaporative pull
    • Active transport

  7. Which radioactive isotope is commonly supplied to leaves as carbon dioxide in tracer experiments?

    • Carbon-12
    • Nitrogen-15
    • Carbon-14
    • Phosphorus-32

  8. In a ringing experiment, where do sugars accumulate after a ring of bark is removed?

    • Inside the xylem
    • Below the ring
    • At the roots
    • Above the ring

  9. Which environmental factor increases the rate of transpiration measured using a potometer?

    • Decreased temperature
    • Increased wind speed
    • Increased humidity
    • Decreased light intensity

  10. What evidence from tracer and ringing experiments confirms that phloem carries organic solutes?

    • Increased xylem pressure
    • Water column breakage
    • Accumulation below ring
    • Accumulation above ring

  11. Which observation provides evidence against the mass flow hypothesis for phloem transport?

    • Water potential gradient
    • Downward movement
    • Loading requires ATP
    • Different solute speeds

  12. Which cell type actively loads sucrose into phloem sieve tubes at the source?

    • Parenchyma cells
    • Sieve tube elements
    • Xylem vessels
    • Companion cells

  13. Which structure in phloem sieve tubes reduces resistance to the flow of sap?

    • Companion cells
    • Lignified walls
    • Plasmodesmata
    • Sieve plates

  14. In phloem mass transport, in which direction does organic sap flow?

    • Xylem to phloem
    • Roots to leaves
    • Sink to source
    • Source to sink

  15. A potometer capillary tube has a cross-sectional area of 0.5 mm^2, and an air bubble moves 10 mm along it in one hour. What volume of water has been taken up?

    • 50 mm^3
    • 20 mm^3
    • 5 mm^3
    • 0.05 mm^3

  16. What process is defined as the evaporation of water vapour from a plant's stomata?

    • Translocation
    • Osmosis
    • Cohesion
    • Transpiration

  17. What accumulates above the ring when a ring of bark is removed from a stem?

    • Sugars
    • Water
    • Mineral ions
    • Starch granules

  18. Which radioactive isotope is used as a tracer to investigate phloem translocation pathways?

    • Nitrogen-15
    • Oxygen-18
    • Carbon-14
    • Phosphorus-32

  19. What happens to the tension in xylem vessels when a plant closes its stomata?

    • It doubles
    • It decreases
    • It stays constant
    • It increases

  20. How does high environmental humidity affect the rate of water uptake by plant roots?

    • Has no effect
    • Increases the rate
    • Decreases the rate
    • Stops it completely

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