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The effect of light intensity on rate of photosynthesis in algae: practical

Quiz by Oak National Academy: GCSE Biology Edexcel Higher

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6 questions
Show answers
  • Q1
    What is an accurate measurement?
    a measurement taken with a ruler
    a measurement using more equipment
    a measurement taken quickly
    a measurement close to the true value
    30s
  • Q2
    How can you use the equipment shown to measure the rate of photosynthesis?
    Question Image
    Measure the change in the pH, shown by the indicator of the indicator.
    Measure the volume of carbon dioxide produced in a specific period of time.
    Count the number of bubbles of oxygen produced in a specific period of time.
    30s
  • Q3
    Why does photosynthesis lead to a colour change in the indicator solution?
    Question Image
    Photosynthesis uses carbon dioxide which increases the pH of the solution.
    Light absorbed by the algal beads reacts with the indicator solution.
    Photosynthesis releases glucose, altering the solution's colour.
    Photosynthesis gives out carbon dioxide which makes solutions more acidic.
    30s
  • Q4
    How can you reduce the intensity of the light that the pondweed receives from the lamp?
    Question Image
    Put a beaker of water between the pondweed and the lamp.
    Increase the brightness of the lamp.
    Move the pondweed away from the lamp.
    30s
  • Q5
    If the indicator changes from cherry red to purple, what does this tell you about the rate of photosynthesis?
    photosynthesis is happening at a high rate
    photosynthesis has stopped completely
    there is no photosynthesis occurring
    photosynthesis is happening at a low rate
    30s
  • Q6
    What is a logical prediction for this investigation?
    Question Image
    As distance increases, the rate of photosynthesis will stay the same.
    As distance increases, the rate of photosynthesis will increase.
    As distance increases, the rate of photosynthesis will decrease.
    30s

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