photosynthesis lock and key of earth topic #2015 matt jakubik
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Photosynthesis
Lock and Key of Earth
Topic #2015Matt Jakubik
Why Learn About Photosynthesis?
• Photosynthesis is the most important chemical reaction on earth.
What is it?
• Process plants use to convert carbon dioxide and water into sugar and oxygen
Picture taken from Life: The Science of Biology, 4th edition, by Sinauer Associates and WH Freeman
Plants as Autotrophs
• Autotrophs: Make their own energy
• Heterotrophs: Get energy from other living organisms
Light• How do plants make their energy?
• Is all light the same?
• The more the better?
• What properties does light have?
Wavelength
is the
symbol for wavelength
• Energy of light is inversely related to the wave length
Picture taken from Life: The Science of Biology, 4th edition, by Sinauer Associates and WH Freeman
Light quality• Spectrums
• Visible light
• Plants mainly use Red and Blue
• Why are plants green?
Picture taken from Life: The Science of Biology, 4th edition, by Sinauer Associates and WH Freeman
Light Quantity
• Measured in micromoles/m²
• Light quantity is the amount of light that hits a surface
• What variables can you think of that would affect light quantity?
Duration• Generally referred to as daylength in
the field.• Affects flowering, bulbset, tuberset,
germination, budset… etc.
• What are some benefits of greenhouse lighting? (think back to what we discussed in the last slide)
Two Types of Photosynthesis
C3-has 3 carbon chainsC4-has 4 carbon chains
C3 Plants
Cannot increase increase rate of photosynthesis when light intensity is greater than 1/3-1/2 full sunlight
Examples-soybeans, cotton, potatoes, alfalfa, sugarbeets, cool season grasses
C4 Plants
Can continue to increase their rate of photosynthesis past full sunlight
Examples-corn, sorghum, sugarcane, and warm season grasses
So Where Does the Light Go to Do It’s Thing?
Plant Cell Structure• The following are
important to know• Xylem• Phloem• Guard cell• Stoma• Chloroplasts
Picture taken from Life: The Science of Biology, 4th edition, by Sinauer Associates and WH Freeman
Plant Organelle Function
• Xylem• Phloem• Guard Cell• Stomata
Stomata
Picture taken from Life: The Science of Biology, 4th edition, by Sinauer Associates and WH Freeman
The All Important Chloroplast
• What is the chloroplast?
• What is chlorophyll?
• Thylakoids?
Picture taken from Life: The Science of Biology, 4th edition, by Sinauer Associates and WH Freeman
Formula for photosynthesis
6H2O + 6CO2 ----------> C6H12O6+ 6O2
In English terms.Where does light fit in?
Factors affecting photosynthesis
• CO2 concentration• Temperature• Available water• Light