Difference between revisions of "GCSE Biology Required Practical: Factors Affecting the Rate of Photosynthesis"
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==Key Stage 4== | ==Key Stage 4== | ||
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===Meaning=== | ===Meaning=== | ||
Investigate the effects of [[light]] [[intensity]] on the rate of [[photosynthesis]]. | Investigate the effects of [[light]] [[intensity]] on the rate of [[photosynthesis]]. | ||
Revision as of 10:46, 13 April 2019
Key Stage 4
Meaning
Investigate the effects of light intensity on the rate of photosynthesis.
Method
- Independent Variable - Distance between the light source and plant.
- Dependent Variable - Number of bubbles produced by the plant.
- Control Variables - Brightness of the light. Frequencies that the light emits. Ensure no other light source than the one used in the experiment.
- Fill a boiling tube with 0.2% solution of sodium hydrogen carbonate.
- Place a length of pond weed in the boiling tube with the cut end at the top.
- Use a metre rule with zero at the light source to fix the boiling tube at 10cm from the light source.
- Use a timer to count the number of bubbles produced by the pond weed.
- Repeat steps three and four 6 times increasing the distance by 10cm each time.