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Photosynthesis (Let’s get into this)

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Presentation on theme: "Photosynthesis (Let’s get into this)"— Presentation transcript:

1 Photosynthesis (Let’s get into this)
Jan Ingenhousz & Julius Robert Mayer Natalie Marulanda and Clare Robinson

2 Prior Knowledge J.B. Van Helmont
Scientists previously thought that plants got their mass from soil In early 1600s, Helmont observed a tree for five years He incorrectly concluded that mass of plants come from the absorption of water (Di Giuseppe et al, 2003)

3 Prior Knowledge Stephen Hales
In 1727, Hales wrote a book that accounts a lot of experiments on plant physiology Realized that light is necessary for plant growth He had a theory that plants absorbed air through their leaves for nourishment and led a series of experiments (Stephen Hales)

4 Prior Knowledge Joseph Priestley
He discovered that gases in air play a role in photosynthesis Led an experiment with a candle and a mint plant He proved that plants release a gas that supports combustion (Di Giuseppe et al, 2003)

5 Experiments & Results Jan Ingenhousz 1779
In 1779, he tested the effects of sunlight and darkness on aquatic plants When the plant is in sunlight, oxygen is produced by green parts of the plant In darkness, oxygen is not produced Sunlight is vital for photosynthesis to occur (Jan Ingenhousz)

6 Experiments & Results Julius Robert von Mayer
In 1842, he stated that “energy can be neither created nor destroyed” Photosynthesis is a conversion of light energy into chemical energy to enable plants to produce their own food in the form of simple sugars The sun is the source of energy for plants (Julius von Mayer)

7 What Did We Learn? The green parts of plants (chlorophyll) release oxygen when exposed to sunlight There exists a natural cycle of gases Sunlight is the source of energy for plants Sunlight is essential for all living organisms

8 Works Cited Di Giuseppe, Maurice, et al. (2003). Nelson Biology 12 (pp ). Toronto, ON: Nelson. Jan Ingenhousz - Wikipedia, the free encyclopedia. (n.d.). Wikipedia, the free encyclopedia. Retrieved November 14, 2010, from Jan Ingenhousz — Biography. (n.d.). Macroevolution.net – All you wanted to know and more. Retrieved November 14, 2010, from Julius von Mayer - Wikipedia, the free encyclopedia. (n.d.). Wikipedia, the free encyclopedia. Retrieved November 14, 2010, from Stephen Hales - Wikipedia, the free encyclopedia. (n.d.). Wikipedia, the free encyclopedia. Retrieved November 14, 2010, from


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