Photosynthesis (OCR Gateway GCSE Biology)

Exam Questions

34 mins12 questions
1
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1 mark

An experiment is set up with four test tubes as shown in the diagram below. All four test tubes are left in sunlight for 6 hours.

1-2

Which test tube would contain the least amount of dissolved carbon dioxide after 6 hours?

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    2
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    Which statement correctly describes why plants are called primary producers?

    • They release oxygen into the atmosphere

    • They use chemical energy from the sun to produce glucose

    • They release heat energy during photosynthesis

    • Energy stored in the biomass of plants makes its way through the food chain

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    3
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    The process of photosynthesis happens in two main stages.

    Which row accurately describes each stage?

      Stage 1 Stage 2
    A

    Energy from light splits water into oxygen gas and hydrogen ions

    Carbon dioxide combines with hydrogen ions to make glucose

    B

    Carbon dioxide combines with water

    Glucose is made and oxygen released

    C

    Carbon dioxide is taken into the leaf through stomata

    Energy from light is used to combine carbon dioxide with hydrogen

    D

    Energy from light splits carbon dioxide into carbon and oxygen atoms

    Water combines with the carbon and oxygen atoms to make glucose

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      4
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      The following experimental set-up is used to measure the rate of oxygen production of an aquatic plant from photosynthesis.

      The experiment was repeated several times and the mean volume of oxygen collected was determined. 

      insert-diagram_-6-q9-experiment

      Which two factors should be kept constant during the experiment?

      • The size of the funnel and temperature of the water.

      • The size of the aquatic plant and the amount of water in the beaker.

      • The size of the aquatic plant and the amount of gas in the measuring cylinder.

      • The distance from the light source and size of the aquatic plant.

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      5
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      The diagram below shows the results of three experiments to measure the rate of photosynthesis under different conditions.

      Experiment 1 measured the effect of light intensity on photosynthesis

      Experiment 2 measured the effect of temperature on photosynthesis

      Experiment 3 measured the effect of carbon dioxide on photosynthesis

      6-q5-limiting-factors

      Which of the following correctly identifies the limiting factor for photosynthesis in each experiment?

        1 2 3
      A light intensity light intensity carbon dioxide concentration
      B temperature temperature light intensity
      C light intensity temperature carbon dioxide concentration
      D light intensity carbon dioxide concentration temperature

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        6
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        Higher Tier Only

        The graph shows the effect of carbon dioxide concentration on the rate of photosynthesis.q5-paper1h-spec2018-ocrgcsebio
        Where on the graph is carbon dioxide a limiting factor?

        • X only

        • X and Y

        • Y and Z

        • Z only

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        7
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        Higher Tier Only

        The inverse square law in relation to light intensity (i) and distance (d) from the light source is shown by:

        • i ∝ d2

        • i ∝ 1/d2

        • i2 ∝ 1/d

        • i2 ∝ d

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        8
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        Higher Tier only

        A light source is placed 0.5m from a plant. The relative light intensity falling on the plant is 2 units.

        The light source is moved to 1m away.

        What is the relative light intensity falling on the plant now?

        • 0.125

        • 0.25

        • 0.5

        • 1.0

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