Investigating Photosynthesis Flashcards
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