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Effect of light on photosynthesis.

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Aim: Effect of light on photosynthesis. What is photosynthesis? Plants need and use the same light of foods as animals but while animals have to eat other things to get their food, plants make it themselves. The way they do this is called photosynthesis. The other ways that plants are different from animals, such as having leaves and root or being green, they are all linked with photosynthesis. In photosynthesis, plants take carbon dioxide from the air and water from the soil, and use the energy from the sunlight to convert them into food. The first food they make is glucose but that can later be changed into other food types. The sunlight is absorbed by the green pigment chlorophyll. Carbon hydrates contain the elements carbon, hydrogen, and oxygen as in glucose. The carbon and oxygen could be supplied by carbon dioxide from the air. In addition, the hydrogen could come from the water in the soil. The nitrogen and sulphur needed for making protein could come from nitrates and sulphates in the soil. This builds up of complex food molecules from simpler substances this is called synthesis. ...read more.


Temperature is also a limiting factor; temperature affects the enzymes that control the chemical reactions of photosynthesis. Prediction: I predicted that the smaller the distance between the plant and the sauce of light, the greater would be the rate of photosynthesis. As out lined in the introduction, light is essential for the process of photosynthesis. Therefore the closer the light source is to the plant, the greater will be the intensity of the light and so the chlorophyll within the plant will be able to photosynthesise at a faster rate. As discussed in the introduction light is one of the limiting factors in the process of photosynthesis. The existence of light is esational for this process, as the following equation shows: LIGHT Carbon Dioxide + Water Glucose + Oxygen CHLOROPHYLL The role of light within photosynthesis is too absorbed by chlorophyll. Chlorophyll is a green pigment present in the leafs of plants, once chlorophyll has absorbed light it is able to convert carbon dioxide and water into glucose and oxygen. Therefore, the more the light that is available to the green plant, the greater will be the rate of photosynthesis and so more glucose and oxygen will be formed. ...read more.


My process was well planned and it was repeated so that I could take an average of the results. This made sure that I do not end up with any anonymous results. Evaluation: For my experiment, I had to find out whether light affects the rate of photosynthesis. From my results I obtained, I found that light does affect photosynthesis. The results that I got where the ones that I predicted. The results that I obtained were good as they were as I excepted. However, there are ways in which I could have improved my results and made them more accurate. I could have improved my experiment by counting the bubbles more accurately buy letting two people counting instead of just one person counting. The apparatus that I used was accurate, so I did not get any anonymous results. My range was good because I had measured every 10 cm but if had measured it every 5cm I would have get more accurate. I had enough results to figure out if light does affect the rate of photosynthesis. If I had wanted to, I could have obtained more results by getting closer distances e.g. every 5 cm, but I do not think it would make much of a difference to my conclusion. ...read more.

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