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# How does light intensity affect the photosynthesis of a Canadian water weed

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Introduction

How does light intensity affect the photosynthesis of a Canadian water weed? Photosynthesis happens in all types of plants, whether on land or in the water. Photosynthesis is a process that plants use every minute in order to survive. They create the food that they need from Carbon Dioxide and Water. Here is the full, balanced chemical equation; Carbon Dioxide + Water Oxygen + Glucose CHLOROPHYLL Or the chemical equation: 6CO2 + 6H2O 6O2 + C6H12O6 With these equations, we are going to see that at what rates photosynthesis happens in this Elodea. We intend to use bulbs, to provide the 'sunlight' for our Elodea, if we use any kind of filter, then we would use a blue filter, red filter and yellow. We would not use the green filter, as that would turn the light green. If we turn the light green then the green chlorophyll would reflect the light. We would also have to control the temperature in the beaker full of Elodea, as if the temperature increased too much it would either denature the enzymes, ruining the experiment, or it would make the photosynthesis rates increase massively. ...read more.

Middle

The Elodea produced bubbles at a steady rate at each different length from the beaker of it. Here are my results: 5cm - 44 bubbles a minute 10cm - 26 bubbles a minute 15cm - 15 bubbles a minute 20 cm - 3 bubbles a minute There were some things that we could have done, that would have massively improved the fairness of the test and also our results. Since I did my experiment in a room, which held in it another 10 people doing the same experiment, although we shut the curtains, I would still have got light from the other lamps. For an ideal experiment, we would have a completely dark room apart from the one lamp we were using. So that we could keep a constant temperature in the beaker of water, I should, next time, place another beaker of water in between the beaker of water filled with Elodea and the lamp. This would mean that the heat rays would be absorbed by the other beaker. ...read more.

Conclusion

As our apparatus, I took one beaker of water, and put our healthy piece of Elodea in it. I then put a funnel over the top of the Elodea so that the bubbles would travel up it. Then I installed a lamp and turned it on to create the 'sunlight.' Then we recorded the distances and the rate that bubbles of oxygen were produced. But of course, before all this, I shut all the curtains and would if possible turn off all other light sources. So that there is only one light, our lamp. I think that the experiment would produce very concise and truthful numbers and rates for the amount of bubbles. I do not think that I got any freak numbers, anomalous results. The experiment would also be the same if one was able to do the same for a plant that is outdoors and does not have to be under water. We used an Elodea because it is much easier to collect bubbles, as you can see them. The results would be the same whether you used an outdoor plant or did the test again, including all the precautions to minimalise freak results and other changes. OLI GREGORY 3177 ...read more.

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1. ## How Does Light Intensity Affect The Levels OfPhotosynthesis In Canadian Pond Weed

Eventually, a level will be reached where an increase in light intensity will have no more effect on the rate of photosynthesis, as there will be another limiting factor, in this case probably temperature. Research and Information Light intensity is to be varied by increasing and decreasing the distance from the light source to the plant.

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2. ## Factors That Affect Photosynthesis.

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1. ## Investigating the effect of Light Intensity on Elodea.

Fill a beaker with water (500cm3) of water and add a spatula of sodium hydrogen carbonate. Place a funnel and an upturned test tube full of water over the Elodea (as shown below): Measure a distance with a 1m rule e.g. 50cm from the plant and place the lamp there.

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2. ## How does light intensity affect the rate of photosynthesis

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