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What is photosynthesis? Experiments that discovered the process.

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Introduction

´╗┐What is photosynthesis? The process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product Greek Scientists concluded that plants gain mass from soil minerals: Around 350BC Greek Scientists and Aristotle also studied plant growth. They concluded that the only thing touching plants was soil, so they decided that plants grow and gain mass by taking in minerals from the soil. However air also touches plants but Greek Scientists were unable to see this. ...read more.

Middle

He then had dried the soil, and the mass of the soil had very little change, (60g less)] He concluded that because the weight of the soil had changed not by much, the tree must have gained mass from another source. The reason for this theory is because Helmont had only added water to the willow tree. Therefore he concluded that the tree must have gained mass by taking in water. Scientist now have come to know that plants can also gain mass by using co2 from the air- however Helmont?s experiment was very important to our research today because we found out that plants don?t just gain mass by taking in minerals from the soil. ...read more.

Conclusion

The flame again went out after a short time, but after a few weeks the candle coul be re-lit. Priestly then decided that another source use up something in the container. He a;lso found out that the living plant restored the air so the candle would burn again. Priestley experiment 2: Filled a sealed container with exhale air. He put a mouse in the air, and found out that the mouse only survived for a few seconds. He filled a second container with exhale air. He put another mouse into the container and it survived for a few minutes. From these two experiments Joseph concluded that plants restore something to the air that burning and breathing take out. We now know that this is called oxygen - used in photosynthesis. ...read more.

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