An experiment on finding the factor that can increase the rate of photosynthesis
Factors affecting photosynthesis pdf
Cut the stem of a bubbling pond weed which has been well illuminated to about 5cm. If the heaters are not electric and burn a fuel like paraffin, then lots of carbon dioxide is produced - quite handy, two factors catered for at the same time! Some was used by small invertebrates that were found living within the pieces of elodea. How can we prove that oxygen was the gas produced? It could be repeated more times to help get rid of any anomalies. However it is probably a good idea to replace it every so often with a fresh supply from an aquarist centre or a pond. Check the Elodea to see if it is bubbling. The graph should be reasonably linear at first e. Procedure a Set up the apparatus as shown in a darkened room. In summer it might get too hot so extra shade and ventilation may be needed to create cooler conditions. It is possible that it had been left here for a while which caused the lamp to heat the elodea up. They will test positive for starch, which is built up from the glucose produced. Interpretation I will analyse the results for how the amount of light and CO2 affects the rate of photosynthesis. However, plants exposed to such conditions usually have protective features to include thick, waxy cuticles and hairy leaves. Measuring photosynthesis via the uptake of carbon dioxide Using 'immobilised algae' - It's easy and accurate to measure the rate of photosynthesis and respiration using immobilised algae in hydrogen carbonate indicator solution - known as the 'algal balls' technique.
BUT take care that the greenhouse does not get too hot eg by opening ventilation systems or putting up shades. However, just prior to point X on the graph, the increase in rate slows down, and finally at point X on the graphs, the rate of photosynthesis reaches a maximum irrespective of the light intensity.
Measuring the rate of photosynthesis by measuring the rate of oxygen gas production in the gas syringe is more accurate but requires more time to get a set of readings to plot a graph.
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Rate of photosynthesis experiment
The available mass of carbon dioxide increases with each addition. The accuracy of this experiment is limited by a number of factors. The above apparatus is typical of that used in rate of reaction experiments in chemistry. Refer to teaching notes. If you harvest several plants and record how much mass they have accumulated you will have an accurate measure of the surplus photosynthesis over and above the respiration that has taken place. Some was used by small invertebrates that were found living within the pieces of elodea. However, you can probably think of several inaccuracies in this method. The line goes up steadily but then between a light intensity of and levels off very quickly. Suck up about 10 cc's of water.
Assessment Two rubrics will be used to assess student lab report sample of report included below and student participation. Doing this could lead to being disqualified from all the subjects that you are taking.
The students can be allocated to investigate a particular factor that affects the rate of photosynthesis, or they can choose from this list, or they can develop their own ideas.
This increases turgor pressure and minimizes "limp" leaves.
It could be temperature.
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