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Xylem, phloem and transpiration

10th grade (Year 11 in England) · 16 questions · Common Core: NGSS.HS-LS1-2 · England: KS4 Combined Science: Transport systems

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  1. Question 1

    What is transpiration?

    • A. loss of water vapour from leaves, mainly through stomata
    • B. moving sugar in the phloem
    • C. taking in oxygen through roots
    • D. making sugar in leaves

  2. Question 2

    Xylem or phloem? It made of dead cells with lignin.

    • A. xylem
    • B. phloem

  3. Question 3

    In a potometer, the air bubble moves 4 mm in 2 minutes. What is the rate of water uptake in mm per minute?

    Answermm/min

  4. Question 4

    Root hair cells are adapted to absorb water because they…

    • A. are dead
    • B. have a large surface area
    • C. have thick waxy walls
    • D. contain many chloroplasts

  5. Question 5

    Xylem or phloem? It made of living cells.

    • A. xylem
    • B. phloem

  6. Question 6

    In a potometer, the air bubble moves 13 mm in 2 minutes. What is the rate of water uptake in mm per minute?

    Answermm/min

  7. Question 7

    Which conditions make transpiration fastest?

    • A. hot, dry, windy and bright
    • B. cold, humid and still
    • C. humid and dark
    • D. dark and cold

  8. Question 8

    Xylem or phloem? It transports mineral ions.

    • A. xylem
    • B. phloem

  9. Question 9

    In a potometer, the air bubble moves 15 mm in 2 minutes. What is the rate of water uptake in mm per minute?

    Answermm/min

  10. Question 10

    What do guard cells do?

    • A. make chlorophyll
    • B. open and close the stomata
    • C. carry sugar
    • D. anchor the roots

  11. Question 11

    Xylem or phloem? It transport called translocation.

    • A. xylem
    • B. phloem

  12. Question 12

    In a potometer, the air bubble moves 16 mm in 2 minutes. What is the rate of water uptake in mm per minute?

    Answermm/min

  13. Question 13

    Which conditions make transpiration fastest?

    • A. dark and cold
    • B. hot, dry, windy and bright
    • C. cold, humid and still
    • D. humid and dark

  14. Question 14

    Xylem or phloem? It made of living cells.

    • A. xylem
    • B. phloem

  15. Question 15

    In a potometer, the air bubble moves 85 mm in 10 minutes. What is the rate of water uptake in mm per minute?

    Answermm/min

  16. Question 16

    Which conditions make transpiration fastest?

    • A. cold, humid and still
    • B. dark and cold
    • C. hot, dry, windy and bright
    • D. humid and dark

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Answer key: Xylem, phloem and transpiration

  1. 1. A. loss of water vapour from leaves, mainly through stomata

  2. 2. A. xylem

  3. 3. 2 mm/min

  4. 4. B. have a large surface area

  5. 5. B. phloem

  6. 6. 6.5 mm/min

  7. 7. A. hot, dry, windy and bright

  8. 8. A. xylem

  9. 9. 7.5 mm/min

  10. 10. B. open and close the stomata

  11. 11. B. phloem

  12. 12. 8 mm/min

  13. 13. B. hot, dry, windy and bright

  14. 14. B. phloem

  15. 15. 8.5 mm/min

  16. 16. C. hot, dry, windy and bright