Lesson 3.1.3a

3.1.3a Transport tissues and transpiration Quiz: OCR Biology, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.1.3a, Transport tissues and transpiration: 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 plants require a specialised transport system?

    • Low metabolic rate
    • High surface area
    • Large SA:V ratio
    • Small SA:V ratio

  2. Which tissue transports water and dissolved mineral ions up the plant?

    • Palisade mesophyll
    • Phloem
    • Xylem
    • Epidermis

  3. Which cells are closely associated with sieve tube elements to support their metabolic functions?

    • Companion cells
    • Collenchyma cells
    • Parenchyma cells
    • Guard cells

  4. Which structural feature is characteristic of mature xylem vessel elements?

    • Flexible cellulose walls
    • Living sieve tubes
    • Lignified dead cells
    • Nucleated cells

  5. What is the primary function of lignin in xylem vessel walls?

    • Cell division
    • Glucose storage
    • Waterproofing and support
    • Active transport

  6. Which main assimilate is transported through phloem sieve tube elements?

    • Sucrose
    • Starch
    • Glycogen
    • Glucose

  7. Through which structures does most water vapour leave a leaf during transpiration?

    • Stomata
    • Root hairs
    • Cuticle
    • Lenticels

  8. What process does a potometer primarily estimate by measuring water uptake rate?

    • Photosynthesis rate
    • Translocation rate
    • Respiration rate
    • Transpiration rate

  9. Why does a decrease in humidity increase the rate of transpiration?

    • Shallower water gradient
    • Steeper water gradient
    • Stomatal closure
    • Higher air pressure

  10. Which environmental change directly increases the rate of transpiration?

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

  11. A bubble moves 12 mm in 5 minutes in a 0.5 mm² capillary. What is the uptake rate?

    • 1.2 mm³ min⁻¹
    • 2.4 mm³ min⁻¹
    • 0.5 mm³ min⁻¹
    • 6.0 mm³ min⁻¹

  12. Which condition causes stomatal closure to reduce transpiration during water stress?

    • Soil drought
    • High temperature
    • High light intensity
    • Increased wind speed

  13. Where is xylem located in a cross section of a dicotyledonous root?

    • Scattered bundles
    • Epidermal layer
    • Outer ring
    • Central star shape

  14. Why are plant tissue sections stained before light microscopy observation?

    • To magnify structures
    • To increase contrast
    • To dissolve lignin
    • To preserve cells

  15. Transpiration occurs as an inevitable consequence of uptake of which gas?

    • Methane
    • Nitrogen
    • Oxygen
    • Carbon dioxide

  16. What is the surface area to volume ratio of a cube with side length 2 cm?

    • 6:1
    • 1.5:1
    • 12:1
    • 3:1

  17. Why does a plant shoot with greater total leaf area transpire faster?

    • Fewer stomata present
    • Smaller surface area
    • Thicker waxy cuticle
    • More stomata present

  18. Why does a plant wilt on a hot, windy day despite moist soil?

    • Transpiration exceeds uptake
    • Stomata remain open
    • Xylem vessels collapse
    • Uptake exceeds transpiration

  19. Why must a potometer shoot be cut and assembled underwater?

    • Increase transpiration rate
    • Prevent air bubbles
    • Prevent water loss
    • Block root pressure

  20. In which directions do xylem and phloem transport substances?

    • Both directions; upward
    • Upward; both directions
    • Both directions; downward
    • Downward; upward

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