Investigating Photosynthesis Flashcards

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1
Q

Describe how limiting factors can be investigated using pond weed

A
  • a test tube containing the pond weed and water is connected to a capillary tube full of water which is connected to a syringe (photosynthometer)
  • a source of white light is placed at a specific distance from the pondweed
  • the pondweed is left to photosynthesise for a set amount of time, the oxygen released will collect in the capillary tube
  • at the end of the experiment the syringe is used to draw the gas bubble in the tube up alongside a length of ruler and the length of the gas bubble is measured (vol of O2)
  • experiment should be repeated and average used
  • can carry out experiment with light at different distances or at different temperatures
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