Chapter 8: Photosynthesis. 8-2 Photosynthesis: An Overview Objectives: Explain what the experiments of van Helmont , Priestly, and Ingenhousz reveal about how plants grow. State the overall equation for photosynthesis. Describe the role of light and chlorophyll in photosynthesis.
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8-2 Photosynthesis: An Overview
Explainwhat the experiments of van Helmont, Priestly, and Ingenhousz reveal about how plants grow.
Statethe overall equation for photosynthesis.
Describe the role of light and chlorophyll in photosynthesis.
Van Helmont’s Experiment
Conclusion: Most of the gain in mass had come from water.
What he did not realize? Carbon dioxide in the air made a major contribution to the mass of his tree.
Conclusion: Oxygen was necessary to keep a candle flame burning.
The experiments performed by van Helmont, Priestly, and Ingenhousz led to work by other scientists who finally discovered that in the presence of light, plants transform carbon dioxide and water into carbohydrates, and they also release oxygen.
6CO2 + 6H2O C6H12O6 + 6O2
carbon dioxide + water sugars + oxygen
Photosynthesis uses the energy of sunlight to convert water and carbon dioxide into high-energy sugars and oxygen.
In addition of water and carbon dioxide, photosynthesis requires light and chlorophyll, a molecule in chloroplasts.