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Rate of photosynthesis and limiting factors

10th grade (Year 11 in England) · 16 questions · Common Core: NGSS.HS-LS1-5 · England: KS4 Combined Science: Photosynthesis

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  1. Question 1

    Light intensity is inversely proportional to the square of the distance from the lamp. A lamp is moved from 10 cm to 20 cm from a plant. The new light intensity is what fraction of the old one? Give a decimal.

    Answer

  2. Question 2

    Farmers add paraffin heaters to greenhouses in winter. Which two factors does this increase?

    • A. light and water
    • B. light and oxygen
    • C. temperature and carbon dioxide
    • D. water and oxygen

  3. Question 3

    Bubbles per minute from pondweed at different lamp distances: 10 cm: 70 20 cm: 17.5 30 cm: 7.8 40 cm: 4.4 50 cm: 2.8 How many fewer bubbles per minute were counted at 30 cm than at 20 cm?

    Answer

  4. Question 4

    Light intensity is inversely proportional to the square of the distance from the lamp. A lamp is moved from 20 cm to 60 cm from a plant. The new light intensity is what fraction of the old one? Give a decimal.

    Answer

  5. Question 5

    On a graph, the rate rises with light intensity and then levels off. Why does it level off?

    • A. The plant has died
    • B. Light stops reaching the leaf
    • C. Another factor, such as CO₂ or temperature, is now limiting
    • D. Oxygen runs out

  6. Question 6

    Bubbles per minute from pondweed at different lamp distances: 10 cm: 55 20 cm: 13.8 30 cm: 6.1 40 cm: 3.4 50 cm: 2.2 How many fewer bubbles per minute were counted at 20 cm than at 10 cm?

    Answer

  7. Question 7

    Light intensity is inversely proportional to the square of the distance from the lamp. A lamp is moved from 20 cm to 80 cm from a plant. The new light intensity is what fraction of the old one? Give a decimal.

    Answer

  8. Question 8

    Why does the rate of photosynthesis fall at very high temperatures?

    • A. Chlorophyll becomes blue
    • B. Carbon dioxide turns into oxygen
    • C. There is too much light
    • D. Enzymes are denatured

  9. Question 9

    Bubbles per minute from pondweed at different lamp distances: 10 cm: 54 20 cm: 13.5 30 cm: 6 40 cm: 3.4 50 cm: 2.2 How many fewer bubbles per minute were counted at 20 cm than at 10 cm?

    Answer

  10. Question 10

    Light intensity is inversely proportional to the square of the distance from the lamp. A lamp is moved from 10 cm to 20 cm from a plant. The new light intensity is what fraction of the old one? Give a decimal.

    Answer

  11. Question 11

    Which of these is NOT a limiting factor for photosynthesis?

    • A. carbon dioxide concentration
    • B. light intensity
    • C. temperature
    • D. oxygen concentration

  12. Question 12

    Bubbles per minute from pondweed at different lamp distances: 10 cm: 51 20 cm: 12.8 30 cm: 5.7 40 cm: 3.2 50 cm: 2 How many fewer bubbles per minute were counted at 20 cm than at 10 cm?

    Answer

  13. Question 13

    Light intensity is inversely proportional to the square of the distance from the lamp. A lamp is moved from 20 cm to 60 cm from a plant. The new light intensity is what fraction of the old one? Give a decimal.

    Answer

  14. Question 14

    On a graph, the rate rises with light intensity and then levels off. Why does it level off?

    • A. Another factor, such as CO₂ or temperature, is now limiting
    • B. Light stops reaching the leaf
    • C. The plant has died
    • D. Oxygen runs out

  15. Question 15

    Bubbles per minute from pondweed at different lamp distances: 10 cm: 54 20 cm: 13.5 30 cm: 6 40 cm: 3.4 50 cm: 2.2 How many fewer bubbles per minute were counted at 50 cm than at 40 cm?

    Answer

  16. Question 16

    Light intensity is inversely proportional to the square of the distance from the lamp. A lamp is moved from 25 cm to 50 cm from a plant. The new light intensity is what fraction of the old one? Give a decimal.

    Answer

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  1. 0.25
  2. temperature and carbon dioxide
  3. 9.7
  4. 0.1111
  5. Another factor, such as CO₂ or temperature, is now limiting
  6. 41.2
  7. 0.0625
  8. Enzymes are denatured
  9. 40.5
  10. 0.25
  11. oxygen concentration
  12. 38.2
  13. 0.1111
  14. Another factor, such as CO₂ or temperature, is now limiting
  15. 1.2
  16. 0.25