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# Photosynthesis Coursework

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Introduction

Photosynthesis Coursework Introduction Background Information Glucose can be converted to sucrose and carried to other parts of the plant in phloem vessels. Glucose can also be converted into starch and stored Light Sometimes light is a limiting factor. A plant may have lots of water and carbon dioxide, but it will not photosynthesize very fast if there is not enough light; increasing the light intensity will make photosynthesis faster. Carbon dioxide Sometimes the level of carbon dioxide is limiting. There may be plenty of light but the plant cannot photosynthesize because it has run out of carbon dioxide. Temperature Temperature can be a limiting factor too. The rate of photosynthesis will be limited if it is too cold for the enzymes to work properly. ...read more.

Middle

Diagram Preliminary method I was going to do a method which involved counting the bubbles at different light intensities. I chose not to do this method as it is and inaccurate method to show volume of O2 produced. This is because each bubble could be of different size therefore containing different amounts of 02 gas. We chose to use a method that gave an accurate result of the O2. Produced. We did preliminary work to find out if the method worked, to prove that O2 was produced and that the variables that we used were correct (amount of solution, length of pond weed and distance of light). So we used the bellow * Firstly Set up the equipment as above * Choose the starting length of the lamp * Find out where the dye stats in the capillarity tube * ...read more.

Conclusion

So therefore showing that the further away the light source is the less the pondweed photosynthesises. This means that my prediction was correct as I predicted "the light intensity increases more oxygen will be produced due to photosynthesis". This also proved my background information, which explained the other limiting factors as well as light. As our method used a scale we could take accurate results we also made the experiment fairer by being in our lab so people couldn't incriminate these results by coming in the door and letting extra light in. Evaluation Our experiment went very well, but if I did it again I would take more measurements so I would get a better spread of data. Also I would keep moving the light source back until the bubble didn't move at all this would mean that photosynthesis couldn't happen because there was to little light, so then I can prove that light is a Major limiting factor. ...read more.

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