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# photosynthesis lab report

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Introduction

Shanshan wang 5/17/06 cell biology Photosynthesis Lab Report Purpose The purpose of this experiment is to explore the factors that might affect the rate of photosynthesis. In our own experiment, our purpose was to determine how different light condition/intensity affects the rate of photosynthesis. Hypothesis According to the concept of photosynthesis, elodea could produce oxygen and glucose if water and carbon dioxide, light are available. So in our experiment, we try to measure how much oxygen could be produced under different light condition. The higher watt light bulb would provide more heat which could fasten the rate of photosynthesis. So we predicted that the higher watt the light bulb is, the more oxygen will be produced. Materials 3 beakers one 25 watt light bulb one 60 watt light bulb 3 small test tubes 3 sprigs of elodea, each one is 4cm Graduate cylinder Marker Water 3 lamps Procedure 1 Use a piece of elodea. ...read more.

Middle

Then mark each test tube where the water lever is 10 Empty each test tube 11 Fill each test tube with water until the black mark 12 Put the water into graduate cylinder 13 Record the amount of water in each of the three graduate cylinders, the amount of water is equal to the amount of oxygen that is being produced Results The watt of light bulb(watt) Amount of oxygen being produced(ml) Dark condition (no light) 0 25 watt 0.25 60watt 0.5 Graph Conclusion Green plants have a food making process that is called photosynthesis. Photosynthesis originally means to put together with light. Plants use green pigments called chlorophylls to trap light energy. The light energy is used to make glucose. So we all knew that light is one of the most important factor that affects the rate of photosynthesis. In this experiment, we were discovering the rate of photosynthesis using different light intensity (different watt of light bulb). ...read more.

Conclusion

There are also spaces to improve this experiment. First of all, we can't make sure the distance between each lamp and beaker is the same. Second, the measurement of oxygen is also not very accurate. There are a lot bubbles attached to the leaves that wont flow towards the end. So its hard to count them. Also because such small amount of oxygen is been given off, its very hard to dip the exactly amount of water into the test tubes. Carbon dioxide is also another important factor in photosynthesis. In this experiment, water does not contain a lot of carbon dioxide, extra carbon dioxide has to be added to the water in this experiment. I think if we add baking soda to water, elodea will definitely produce more CO2. Over all, I am pretty satisfied to our result, it still very accurate even there are some errors. From this experiment, I learned how the light intensity affects the rate. I had a better sense on the process of photosynthesis. ...read more.

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