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PHOTOSYNTHESIS

PHOTOSYNTHESIS. Calvin Cycle. Carbon Fixation (light independent rxn ). C 3 plants (80% of plants on earth). Occurs in the stroma . Uses ATP and NADPH from light rxn . Uses CO 2 . To produce glucose: it takes 6 turns and uses 18 ATP and 12 NADPH. Stroma. Outer Membrane. Thylakoid.

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PHOTOSYNTHESIS

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  1. PHOTOSYNTHESIS

  2. Calvin Cycle • Carbon Fixation (light independent rxn). • C3 plants (80% of plants on earth). • Occurs in the stroma. • Uses ATP and NADPH from light rxn. • Uses CO2. • To produce glucose: it takes 6 turns and uses 18 ATP and 12 NADPH.

  3. Stroma Outer Membrane Thylakoid Granum Inner Membrane Chloroplast

  4. C3 Glucose Calvin Cycle • Remember:C3 = Calvin Cycle

  5. Photorespiration • Occurs on hot, dry, bright days • Stomatesclose • Fixation of O2 instead of CO2 • Produces 2-C molecules instead of 3-C molecules • Produces no sugar molecules or no ATP

  6. Photorespiration • Because of photorespiration: Plants have special adaptations to limit the effect of photorespiration. 1. C4 plants 2. CAM plants

  7. C4 Plants • Hot, moist environments. • 15% of plants (grasses, corn, sugarcane). • Divides photosynthesis spatially. • Light rxn - mesophyll cells. • Calvin cycle - bundle sheath cells.

  8. CAM Plants • Hot, dry environments • 5% of plants (cactus and ice plants) • Stomatesstay closed during day • Stomates open during the night • Light reactions occur during the day • Calvin Cycle occurs when CO2 is present

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