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Photosynthesis Notes

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Megan Snyder

on 30 October 2017

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Transcript of Photosynthesis Notes

Photosynthesis
Chapter 8
In photosynthesis carbon dioxide and water are converted into glucose and oxygen in the presence of light.
6CO2 + 6H2O -> C6H12O6 + 6O2
In order for photosynthesis to occur light must first be trapped. Molecules that trap light are called PIGMENTS. The most important pigment of photosynthesis is CHLOROPHYLL.
Different colors of light have different wavelengths. Each pigment absorbs best at certain wavelengths. 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 also have red and orange pigments called CAROTINOIDS, but in fewer numbers.
Photosynthesis occurs in the chloroplast. A chloroplast contains small membrane bound sacks called thylakoids. A stack of thylakoids is a granum. The space inside the chloroplast but outside the thylakoid is called the stroma.
Photosynthesis has 2 main parts:
1. Light-dependent Reactions
2. Light-independent Reactions
1. Light- Dependent Reactions
- Pigments capture light and use that energy to make ATP
- This takes place in the thylakoid membranes
2. Light- Independent Reactions (Calvin Cycle)
- ATP from the light-dependent reaction is used to join the carbons from CO2 to form glucose
- This takes place in the stroma
Factors that influence the rate of photosynthesis:
You need light, water, and carbon dioxide for photosynthesis to occur, so the amount of each of these that is available will affect the rate of photosynthesis.
Photosynthesis is performed by enzymes, so anything that affects enzyme function will affect the rate of photosynthesis. This includes temperature and pH.
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