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Laboratory work on a theme The dependence of the rate of photosynthesis on light intensity

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Introduction

Vahrusheva Djulya 10ib Laboratory work on a theme "The dependence of the rate of photosynthesis on light intensity" Introduction Photosynthesis is a process of converting light energy to chemical energy. The process of photosynthesis takes place in the chloroplasts, specifically using chlorophyll, the green pigment involved in photosynthesis. I had to test one of two reactions of photosynthesis: the light reaction because only it used the light reaction. The main chemical reaction involved in photosynthesis is: 6CO2+6H2O (+light energy) � C6H12O6+6O2 I controlled all these conditions and made my own experiment, which proved that the light reaction really needs light to produce O2. Aim Determine intensity of photosynthesis on allocation of ?2, depending on the light exposure. ...read more.

Middle

Make 24 circles from leaf uses punch and infiltrate them by water saturated with CO2 2) Infiltrated circles put for six pieces in cups with water, enriched with CO2. 3) One of the cups put in the darkness (control)... ...others put up for the light at different distances from the source and count the time RESULTS Circles float up at different time depending on the light as a result of accumulation in intercellular spaces of the oxygen formed during photosynthesis. I had spotted 45 minutes and then saw a result. Circles in the darkness haven't floated. The circles which were the nearest with the lamp (0 cm) ...read more.

Conclusion

Firstly, is that all conditions were unnatural and all was only a model how O2 is produced in environment. Secondly, I might do the concentrate of CO2 higher, than 0, 5%. Thirdly, lamp isn't a sun and I couldn't do all conditions in definite numbers. Fourthly, I had to tear off leaf of the Chlorophytum. Greenpeace doesn't like it. Fifthly, I had to use only leaf of Chlorophytum because leafs of other plants don't float. Despite of these weaknesses I think that I prove that the amount of emitted oxygen depends on the amount of light energy. It is a very simple experiment and a very effective. Suggestions for improving investigation In my view this experiment will be better if I do in natural conditions uses sun light. But perhaps there will be drawbacks with other conditions. ...read more.

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