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Investigate one of the limiting factors on rate of photosynthesis in a water plant

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Investigate one of the limiting factors on rate of photosynthesis in a water plant INTRODUCTION Photosynthesis is the process by which plants make their own food for photosynthesis to occur the plants need sunlight energy, the energy is absorbed by a green pigment called chlorophyll which is found in the leaves. This energy then combines with water molecules from the soil, and carbon dioxide from the air. Then as a result of this a type of sugar called glucose is produced and oxygen is made. The equation for photosynthesis is 6co2 + 6H2oc6 H12 o6 + 6o2 There are certain things that affect photosynthesis and these are called limiting factors. Things like light intensity can affect the rate of photosynthesis- we call them limiting factors. It doesn't matter if the plant has lots of carbon dioxide and a nice warm temperature. If light is in short supply, then light will limit the rate of photosynthesis Let's say light intensity is limiting photosynthesis, the only way to increase the rate is to increase the limiting factor. ...read more.


And if the light is further away the rate of photosynthesis will be slower seeing as there will be less light energy used to split up the water. EQUIPMENT LIST Test Tube Clamp Canadian Pond Weed Paperclip Lamp/Torch SAFETY I will have to take care that I do not touch the hot bulb or splash any water on it and I will have to follow the labs safety rules. WHAT I WILL DO I will be counting bubbles because they are bubbles of oxygen; I am carrying out this experiment to find the speed of photosynthesis. In a blacked out room I will hold a light at 5 different distances (10 cm, 20 cm, 30 cm, 40 cm and 50 cm) away from the weed in water for a minute each. And will repeat this 3 times each so that I will have 3 sets of results to work from, to help me recognise anomalous results and to get an accurate average. In order to keep this a fair test I will use the same piece of pond weed and water each time so that I don't ...read more.


lamp is less EVALUATION I think that on the whole my experiment went quite wrong, the results I gathered were VERY strange I believe this to be because of the poor quality of the pondweed that I used. With the set of results that I had, I was able to calculate an average, however this still did not follow my prediction! I believe that my measurements were about as accurate as I could get using the apparatus that we had. I experienced many problems during the experiment; I found that due to the poor quality of my pondweed. It was photosynthesing very slowly at some points, and photosynthesing to quickly to count at others, another problem was when the desk lamp was closer to the pond weed it actually caused the pondweed to be hotter than in the other further away experiments, and so this made for a slightly unfair test! If I could do thsis experiment all over again I would have taken the opportunity to use other peoples results as mine were so strange. By Shahnaz Zarif 10s ?? ?? ?? ?? Shahnaz Zarif 10s ...read more.

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