Difference between revisions of "GCSE Biology Required Practical: Factors Affecting the Rate of Photosynthesis"
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#Use a timer to count the number of bubbles produced by the pond weed. | #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. | #Repeat steps three and four 6 times increasing the distance by 10cm each time. | ||
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| + | ===References=== | ||
| + | ====Edexcel==== | ||
| + | :[https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Biology core practicals; light intensity and photosynthesis, pages 90-91, GCSE Combined Science, Pearson Edexcel ''] | ||
Latest revision as of 14:24, 2 November 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.