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Photosynthesis
- What is photosynthesis?
- production of
carbon compounds
in cells using energy
- uses simple inorganic
substances like CO2 and H2O
- energy conversion
- production of
carbon compounds
in cells using energy
- Wavelengths of light
- Visible light: longest
purple; shortest red
- short wavelengths of
energy; X-rays and UV
radiation; high energy
- long wavelengths of
energy; radio waves and
infrared; low energy
- Visible light: longest
purple; shortest red
- Light absorption by chlorophyll
- effectively absorbs red and blue light
- reflects green the most
- first stage in photosynthesis
- absorbed by
black pigments
- many pigments but
mostly chlorophyll
- chloropyll appears green;
reflects green light
- effectively absorbs red and blue light
- Oxygen production
in photosynthesis
- O2 produced from
photolysis of water
- photolysis
- splitting of water to produce
electrons needed in other stages
- H20 --> 2e- + 4H+ + O2
- only occurs in light
- lysis = disintergration
- splitting of water to produce
electrons needed in other stages
- O2 = waste product;
diffuses away
- O2 produced from
photolysis of water
- Effects of photosynthesis on Earth
- changes to atmosphere,
oceans, rock depositions
- first done by prokaryotes
- Great Oxidation Event
- rise in O2 conc.
- first glaciation due to
reduction in greenhouse effect
- caused oxidation of
dissolved iron and
precipitated on sea bed
- first glaciation due to
reduction in greenhouse effect
- methane & CO2 =
greenhouse gases
- banded iron
rock formation
- changes to atmosphere,
oceans, rock depositions
- Production of carbohydrates
- Energy needed to produce carbs
and other C compounds from CO2
- CO2 + H20 = carbs + O2
- endothermic
- energy from light
- Energy needed to produce carbs
and other C compounds from CO2
- Limiting factors
- Temperature
- Light intensity
- CO2
- limits rate under optimal level
- only 1 at a time;
furthest from optimum
- Temperature
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