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Oxygen bubbles are given off by the plant in response to photosynthesis.
This experiment will look at the affect of light intensity on the rate of photosynthesis on Elodea plants.
Investigate The Influence Of Carbon Dioxide On The Rate Of Photosynthesis Biology – Leaving Cert Experiments.
In this practical experiment, the rate of photosynthesis is measured by counting the number of bubbles rising from the cut end of a piece of Cabomba pondweed.
When the temperature rises the rate of photosynthesis rises also.
Plants utilize the process of photosynthesis to convert solar energy into chemical energy to produce cellular respiration. The process of photosynthesis uses the energy of sunlight, which is then absorbed into different pigment types to help the cyclical functions that eventually create atmospheric oxygen. In this experiment we asked how different colors of light effect the rate of photosynthesis. The experiment attempted to see how blue colored and red colored lights affected the rate of photosynthesis. It was hypothesized that because plants absorb more red light, then we predict plants in red light should have a higher rate of photosynthesis when compared to plants in blue. The hypothesis was tested by taking the leaves of a live plant and placing the leaves in a flask. A carbon dioxide gas probe was then placed in the flask to test if the levels of carbon dioxide changed. The independent variable was the color of light and the dependent variable was the rate of photosynthesis in change in levels of carbon dioxide per minute per gram. The change in carbon dioxide levels were proportional to the rate of photosynthesis. Thus red light and blue light was placed upon the flasks of leaves for a total of thirty minutes. The first and last ten minutes the leaves were set in the light and the second ten- minute increment the leaves were in the dark. The second ten minutes was to see if carbon dioxide levels decreased thus to control the cellular respiration. The results show in comparing the carbon dioxide levels that the p=value is .36 meaning there was no significance in the comparison. Therefore the different wavelengths in light made no extreme difference on the rate of photosynthesis. In comparison to other experiments done by others the results were much the same finding that neither light wavelength affected the rate of photosynthesis. The experiment was done with a limited amount of time and the leaves were most likely dead by the end of the experiment. A better hypothesis would be to see how the wavelengths of different colored lights like yellow and green affect the rate of photosynthesis. The use of more live plants would help obtain better results also.
Photosynthesis Practical :: Papers
A) sunlight concentration B) temperature C) chlorophyll concentration D) carbon dioxide availability Effects of the variables and there concentrations: The amount of sunlight will decide the rate of photosynthesis as there will be a an increased rate of photosynthesis due to the increased availability of photons of light....
Plant leaf experiment.
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Mandatory Experiment: to investigate the effect of light intensity OR carbon dioxide concentration on the rate of photosynthesis Equipment: Pondweed (Elodea).
Discover how green plants absorb light in their leaves and convert it to energy by photosynthesis with BBC Bitesize GCSE Biology.
Glossary of Biological Terms ← BACK
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