PHOTOSYNTHESIS
Published on Nov 19, 2015
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PRESENTATION OUTLINE
Photosynthesis Video
In photosynthesis, carbon dioxide and water are converted into glucose and oxygen in the presence of light.
Photo by rishibando
6CO2 + 6H2O -> C6H12O6 + 6O2
In order for photosynthesis to occur, light must first be trapped.
Photo by Nathan O'Nions
Molecules that trap light are called PIGMENTS. The most important pigment of photosynthesis is CHLOROPHYLL.
Photo by DanBrady
Different colors of light have different wavelengths. Each pigment absorbs best at certain wavelengths.
Photo by haglundc
Chlorophyll absorbs best in the violet, blue, and red wavelengths and reflects yellow and green. Our eyes sense this reflected light so chlorophyll looks green.
Plants have red and orange pigments called CAROTINOIDS, but in fewer numbers.
Photo by Jason A. Samfield
Untitled Slide
Photo by myers_pictures
Photosynthesis occurs in the chloroplast. A chloroplast contains small membrane bound sacks called thylakoids.
Photo by the_exploratorium
A stack of thylakoids is a granum. The space inside the chloroplast but outside the thylakoid is called the stroma.
Photo by Nicola since 1972
Photosynthesis has two main parts.
1. Light-Dependent Reaction
2. Light-Independent Reaction
Light Dependent Reactions
Photo by CarbonNYC [in SF!]
Pigments capture light and use that energy to make ATP.
This takes place in the thylakoid membrane.
Photo by @Doug88888
Light-Independent Reactions (calvin cycle)
Photo by Denise Cross Photography
ATP from the light-dependent reaction is used to join the carbons from CO2 to form glucose
Photo by EMSL
This takes place in the stroma.
Photo by BlueRidgeKitties
You need light, water, and carbon dioxide for photosynthesis to occur.
Photo by Sergiu Bacioiu
So, the amount of each of these that is available will affect the rate of photosynthesis.
Photo by Charlotte Gilhooly
Photosynthesis is performed by enzymes, so anything that affects enzyme function will affect the rate of photosynthesis. This includes temperature and pH.
Photo by Jordi Cucurull
