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stomate

stomate. transpiration gas exchange. PHOTOSYNTHESIS!!. Photosynthesis Overview. Energy for all life on Earth ultimately comes from photosynthesis. 6CO 2 + 12H 2 O C 6 H 12 O 6 + 6H 2 O + 6O 2 Photosynthesis is carried out by: Cyanobacteria,Some protists ,+ Land plants .

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stomate

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  1. stomate • transpiration • gas exchange

  2. PHOTOSYNTHESIS!!

  3. Photosynthesis Overview Energy for all life on Earth ultimately comes from photosynthesis. 6CO2 + 12H2O C6H12O6 + 6H2O + 6O2 Photosynthesis is carried out by: Cyanobacteria,Someprotists,+ Land plants

  4. H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ outer membrane inner membrane stroma thylakoid granum chloroplast ATP thylakoid • Chloroplasts • double membrane • stroma • fluid-filled interior • thylakoid sacs • grana stacks • Thylakoid membrane contains • chlorophyll molecules • electron transport chain • ATP synthase • H+ gradient built up within thylakoid sac

  5. Pigments Pigments: molecules that absorb visible light Each pigment has a characteristic absorption spectrum, the range it is capable of absorbing. --chlorophyll a– primary pigment --chlorophyll b– secondary pigment -- carotenoids– accessory pigments

  6. Why are plants green??

  7. Two stages of photosynthesis: • Light-dependent reactions • Requires light as a source of energy Step 1: chlorophyll uses energy from sun to split water molecules Step 2: water molecules split into H & O Step 3: O2 released to atmosphere Step 4: chlorophyll stores some light energy in ATP

  8. Photophosphorylation Using light Adding aphospate group A process

  9. light energy  H2O + + + O2 ATP NADPH sunlight Light Reactions H2O • produces ATP • produces NADPH • releases O2 as a waste product Energy Building Reactions NADPH ATP O2

  10. Thylakoid Structure

  11. Non-cyclic

  12. Light-Independent reactions (Calvin Cycle) • Part of photosynthesis that doesn’t require light Step 1: hydrogen which split from H2O combines with CO2 using energy stored in ATP Step 2: this combination forms glucose (C6H12O6) Step 3: water is formed (byproduct)

  13. Making Sugar The energy captured in the Lt-Dep is now used to fix CO2 and make sugar.

  14. CO2 + + + + ATP NADPH C6H12O6 ADP NADP Calvin Cycle • builds sugars • uses ATP & NADPH • recycles ADP & NADP • back to make more ATP & NADPH CO2 ADP NADP SugarBuilding Reactions NADPH ATP sugars

  15. light energy  CO2 + H2O + C6H12O6 + O2 sunlight Putting it all together Plants make both: • energy • ATP & NADPH • sugars H2O CO2 ADP NADP SugarBuilding Reactions Energy Building Reactions NADPH ATP sugars O2

  16. *respiration occurs in plant cells also, when they need to release the energy stored in glucose

  17. sun light energy  CO2 + H2O + + O2 C6H12O6 glucose H2O ATP energy  + O2 + CO2 + H2O C6H12O6 even thoughthis equationis a bit of a lie…it makes a better story Energy cycle Photosynthesis plants CO2 O2 animals, plants Cellular Respiration ATP The Great Circleof Life,Mufasa!

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