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The Affect Of Light On Photosynthesis.

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Introduction

Shane Garvin The Affect Of Light On Photosynthesis Glucose is absolutely essential in order for plants to work properly as it is used for: * Transporting other substances around the plant * Making fruits (important for seed dispersal) * Making proteins with nitrates * For respiration To produce glucose (energy) plants photosynthesise. Photosynthesis is a process that takes place in the leaves of all green plants to change light energy into chemical energy. There are three materials needed for this process, they are carbon dioxide, oxygen and light energy. The three things enter the leaves in different ways. Light energy (normally from the sun) is absorbed into the leave by chlorophyll. This is the green substance is in the chloroplasts (which live in the palisade cell at the top of the leaves). Water comes up the stem from the soil and carbon dioxide comes from the air around the leaves. The equation for photosynthesis is: Carbon Dioxide + Water Glucose + Oxygen There are three equally significant factors that affect the rate of photosynthesis, they ...read more.

Middle

This should help the accuracy of my first set of results. Then I will start the timer again and wait one minute. During this time I will count the number of oxygen bubble rise from the top of the plant. As oxygen is a by-product of photosynthesis, it should show the rate at which the plant is photosynthesising. After 1 min I will move the test tube another 5 cm away from the lamp. I will move it 5 times, and repeat each experiment three times. This will not only give me a good range but it will also give me more accurate results as I can find the average. From looking at PG 19 of CGP AQA Modular Science Revision guide I know that the less the amount of light energy the slower the photosynthesis rate. When the amount of light energy gets to a certain point the rate of photosynthesis can not get any faster as the chlorophyll can only work at a certain speed. ...read more.

Conclusion

The closer the plant was to the lamp, the more light was available and more chemical energy was able to produced faster. So the further away the light source, the less the concentration of the light and the slower the plant could photosynthesis. I think the results I got support my prediction, as what I just said is the same as in my prediction. I think my result were accurate as none were odd or to far from the line of best fit. This meant I could easily conclude. I think my range of results also made it easier, as there was enough to comment on. If I were to improve my experiment I would have more people counting the bubbles at the same time just to double check the accuracy. To extend my enquiry I would start with my plant a lot closer to the lamp, and move it more gradually. This would test the theory that after a certain point no matter how much the light level is increased the rate of photosynthesis will not speed up. As it is used for Shane Garvin The Affect Of Light On Photosynthesis - 1 - ...read more.

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