Science 9 · Unit 1: Photosynthesis and the carbon cycle · Cambridge Lower Secondary Science Stage 9

Questions

1. 1. 'Photo' means light. What does the word 'photosynthesis' mean?

   • breaking down with water
   • breathing with light
   • growing in the dark
   • making with light
   Check

2. 2. What are the reactants (raw materials) of photosynthesis?

   • glucose and oxygen
   • carbon dioxide and glucose
   • oxygen and water
   • carbon dioxide and water
   Check

3. 3. What are the products of photosynthesis?

   • oxygen and water
   • carbon dioxide and water
   • glucose and oxygen
   • glucose and carbon dioxide
   Check

4. 4. Which green substance in leaf cells captures the energy from sunlight?

   • carbon dioxide
   • chlorophyll
   • starch
   • glucose
   Check

5. 5. Why is a water plant a good choice for collecting the gas made in photosynthesis?

   • Water plants make carbon dioxide instead of oxygen.
   • Land plants cannot photosynthesise.
   • The gas comes off as bubbles that can be seen and collected in a test tube.
   • Water plants do not need light.
   Check

6. 6. Gas collected from a pondweed in sunlight makes a glowing splint relight. What does this show?

   • The gas is water vapour.
   • The gas contains a lot of oxygen.
   • The gas is carbon dioxide.
   • The gas is hydrogen.
   Check

7. 7. As a lamp is moved further away from a water plant, what happens to the light intensity at the plant?

   • It goes up and down.
   • It increases.
   • It stays the same.
   • It decreases.
   Check

8. 📖 This question is about a text that students read in the app.

   8. What should Arun keep the same for all three sets of apparatus?

   • the amount of light
   • the number of bubbles
   • the volume of gas collected
   • the type of plant
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9. 📖 This question is about a text that students read in the app.

   9. Arun keeps the type of plant the same. What else should he keep the same for all three sets of apparatus?

   • the mass of the plant
   • the volume of gas collected
   • the number of bubbles
   • the amount of light
   Check

10. 📖 This question is about a text that students read in the app.

    10. Arun keeps the type and mass of the plant the same. What else should he keep the same for all three sets of apparatus?

    • the volume of gas collected
    • the number of bubbles
    • the temperature
    • the amount of light
    Check

11. 📖 This question is about a text that students read in the app.

    11. In Arun's results table, what should he write for the amount of light for Apparatus B?

    • no light (a dark cupboard)
    • some light (a shady corner)
    • a lot of light (next to a window)
    • 7.2 cm³
    Check

12. 📖 This question is about a text that students read in the app.

    12. Which apparatus collected the most gas?

    • All three collected the same volume.
    • B, in the shady corner (7.2 cm³)
    • C, in the dark cupboard (0.5 cm³)
    • A, next to the window (18.3 cm³)
    Check

13. 📖 This question is about a text that students read in the app.

    13. What conclusion can Arun make from his results?

    • Plants photosynthesise faster when they have more light.
    • Plants need chlorophyll for photosynthesis.
    • Plants use water for photosynthesis.
    • Plants that live in water photosynthesise more slowly than plants that live on land.
    Check

14. 📖 This question is about a text that students read in the app.

    14. What was the variable that Marcus changed in his experiment?

    • the colour of the light
    • the distance of the lamp
    • the number of bubbles per minute
    • the type of water plant
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15. 📖 This question is about a text that students read in the app.

    15. What was the variable that Marcus measured in his experiment?

    • the colour of the light
    • the temperature of the water
    • the type of water plant
    • the number of bubbles given off in one minute
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16. 📖 This question is about a text that students read in the app.

    16. Which of these should Marcus have kept the same in his experiment?

    • the number of bubbles in one minute
    • the type of water plant, the distance of the light and the temperature
    • the colour of the cellophane
    • the colour of the cellophane and the number of bubbles
    Check

17. 📖 This question is about a text that students read in the app.

    17. What is the mean number of bubbles in one minute for red light?

    • 12
    • 10
    • 11
    • 33
    Check

18. 📖 This question is about a text that students read in the app.

    18. What is the mean number of bubbles in one minute for blue light?

    • 30
    • 10
    • 8
    • 12
    Check

19. 📖 This question is about a text that students read in the app.

    19. What is the mean number of bubbles in one minute for green light?

    • 15
    • 4
    • 6
    • 5
    Check

20. 📖 This question is about a text that students read in the app.

    20. What is the mean number of bubbles in one minute for colourless light?

    • 13
    • 36
    • 12
    • 11
    Check