Difference between revisions of "GCSE Biology Required Practical: Factors Affecting the Rate of Photosynthesis"
| Line 3: | Line 3: | ||
Investigate the effects of [[light]] [[intensity]] on the rate of [[photosynthesis]]. | Investigate the effects of [[light]] [[intensity]] on the rate of [[photosynthesis]]. | ||
===Method=== | ===Method=== | ||
| − | *[[Independent Variable]] - | + | *[[Independent Variable]] - Distance between the light source and plant. |
| − | *[[Dependent Variable]] - | + | *[[Dependent Variable]] - Number of bubbles produced by the plant. |
| − | *[[Control Variable]]s - | + | *[[Control Variable]]s - 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. | ||
Revision as of 16:18, 22 November 2018
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.