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Photosynthesis

Photosynthesis. Lock and Key of Earth Topic #2015 Matt 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.

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Photosynthesis

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  1. Photosynthesis Lock and Key of Earth Topic #2015 Matt Jakubik

  2. Why Learn About Photosynthesis? • Photosynthesis is the most important chemical reaction on earth.

  3. 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

  4. Plants as Autotrophs • Autotrophs: Make their own energy • Heterotrophs: Get energy from other living organisms

  5. Light • How do plants make their energy? • Is all light the same? • The more the better? • What properties does light have?

  6. 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

  7. 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

  8. 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?

  9. 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)

  10. Two Types of Photosynthesis • C3-has 3 carbon chains • C4-has 4 carbon chains

  11. 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

  12. C4 Plants • Can continue to increase their rate of photosynthesis past full sunlight • Examples-corn, sorghum, sugarcane, and warm season grasses

  13. So Where Does the Light Go to Do It’s Thing?

  14. 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

  15. 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

  16. 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

  17. Formula for photosynthesis 6H2O + 6CO2 ----------> C6H12O6+ 6O2 In English terms. Where does light fit in?

  18. Factors affecting photosynthesis • CO2 concentration • Temperature • Available water • Light

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