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Photosynthesis1 - Photosynthesis The main energyacquiring...

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Photosynthesis Photosynthesis The main energy- The main energy- acquiring pathway acquiring pathway Plants, algae, cyanobacteria
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Photosynthesis Photosynthesis All life on Earth depends on the Sun (93 million miles away) Provides photosynthesizers with solar energy Photosynthesis: A process that captures solar energy Transforms Solar Energy into Chemical Energy Energy ends up stored in a carbohydrate Photosynthesizers produce all food energy Only 42% of sun’s energy directed towards Earth reaches surface Of this, only 2% is captured by photosynthesizers Of this, only a tiny portion results in biomass
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Photosynthesis 6CO 2 + 12H 2 O C 6 H 12 O 6 + 6H 2 O + 6O 2 reduction oxidation ∆G=+685 kcal/mole Light Energy 18 ATP + 18 H 2 O -> 18 ADP + 18 P i 12 NADPH -> 12 NADP+ +12H+ + 24e-
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Properties of Light Properties of Light Photons Energy packets of light E = 1/ λ λ = wavelength
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Photosynthesis and Leaves Occurs in green Portions of plants - Leaf of flowering - plant - Mesophyll tissue - Chloroplasts - CO 2 enters leaf Through stomata Thylakoid membranes - Unit of photosynthesis Diffuses into chloroplasts In stroma CO 2 combines with H 2 O to form C 6 H 12 O 6 Energy supplied by light
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Photosynthetic Pigments Chemicals that absorb some wavelengths of visible light more Than others Colors least absorbed reflected/transmitted most Chl a+b - absorb violet , blue , and red Transmit green Wavelengths that elicit A particular response
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