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Carbon Dioxide Experiment In Photosynthesis Essay

1531 words - 6 pages

Without carbon dioxide plants cannot photosynthesize. Through reading various books and web pages it was made clear that carbon dioxide is definitely one of the raw materials needed for photosynthesis, but I wanted to see whether this is actually true and if carbon dioxide is taken away completely will the plant photosynthesize at all? By taking a two plants of the exact same species, de-starching them both followed by putting plant one in conditions where carbon dioxide is taken away completely, and plant two will then be put in conditions where carbon dioxide is added, after a day or two in these conditions leaves from both plants will be tested for starch, if the leaf tests positive for starch it means that the plant has photosynthesized, if the leaf tests negatively for starch it means that the plant has not photosynthesized at all. The aim of my experiment is to see whether carbon dioxide is really necessary for photosynthesis, and to see if a plant can photosynthesize at all with no carbon dioxide present in its environment even when it is still exposed to all the other factors that are too needed for photosynthesis.

Review of literature
1. About.com: photosynthesis by Regina Bailey
 Carbon dioxide, water and sunlight are used to produce glucose, oxygen and water. The chemical process is: 6 molecules of carbon dioxide + 12 molecules of water + light = glucose + 6 molecules of oxygen + 6 molecules of water.
 Carbon dioxide is taken in through the stomata in the leaves of the plant.

2. Yahoo. Answers: How does carbon dioxide affect the rate of photosynthesis? By Hareez
 “As carbon dioxide concentration increases, the rate of photosynthesis increases.”
 If concentrations of carbon dioxide are high, photosynthesis may not increase, not because of the carbon dioxide concentration but rather that some of the enzymes of photosynthesis may be working at their maximum rate.
 There is generally only low concentrations of carbon dioxide in the atmosphere, this may be a major limiting factor on photosynthesis levels.

3. Wikipedia the free encyclopaedia: photosynthesis
 Photosynthesis is a process that plants and other organisms use to convert light energy from the sun into chemical energy. This chemical energy is stored in carbohydrate molecules like sugars.

4. The world book encyclopedia of science: The plant world (pages: 18-19)
 Plants are the only living organisms that are able to make their own food.
 Animals cannot make their own food and are therefore directly or indirectly reliant on plants for their food.
 The raw materials needed for photosynthesis are carbon dioxide (from the air and is taken in through the plant’s leaves) and water (from the soil and is taken in through the plant’s roots), these two raw materials combine to primarily produce oxygen and simple sugars.

 In the “dark reaction phase” (doesn’t use light), ATP and NADPH are used to reduce carbon dioxide into a carbohydrate, this process is known as...

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