Chapter 7 Photosynthesis. Overview of Photosynthesis chem rx produces sugar in presence of light 6CO 2 + 12H 2 O  C 6 H 12 O 6 + 6O 2 + H 2 O Requires:

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  • PhotosynthesisChapter 7

  • Overview of Photosynthesischem rx produces sugar in presence of light6CO2 + 12H2O C6H12O6 + 6O2 + H2ORequires:lightchlorophyll to capture lightraw materials (CO2 and H2O)Rate depends on:availability of raw materialslight intensitytemperature

  • Light EnergyAll life on Earth depends on a star 93 million miles awayOnly 42% of suns energy directed towards Earth reaches surfaceOf this, only 2% is captured by photosynthesizersOf this, only a tiny portion results in biomass

  • Structure of Plant Cell

  • Structure of Chloroplast

  • Process of PhotosynthesisLight Reaction: can only occur in the presence of light; forms materials for next phase1) Chlorophyll in grana absorbs light photon2) Energy from photon excites e-3) Excited e- moves along e- transport chain4) e- releases energy to form ATP (P+ADP)5) e- lost from chlorophyll replaced by photolysis: H2O He- + H+ + O26) O2 is released to the environmentproducts = ATP + H+ + O2

  • Light Reaction in Photosynthesis

  • Dark Reactions of Photosynthesis also called Calvin Cycle; uses light reaction products to form glucose; occurs in in stroma1) CO2 + RuBP (5-C) + ATP 2PGA (3-C)2) PGA + H+ PGAL (3-C)3) PGAL used to manufacture RuBP to continue cycle4) Some PGAL used to manufacture glucose2 PGAL (3-C) C6H12O62 cycles must occur before glucose is made

  • Dark Reaction (Calvin Cycle)

  • Simplified Photosynthesis Reaction

  • Complete Photosynthesis Reactions

  • The End

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