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Photosynthesis Part 1

Photosynthesis Part 1. Pages 108 to 111. Autotrophs. Name some common producers Plants, algae, some protists , cyanobacteria Define photoautotroph An organism that uses light energy to produce food Define chemoautotroph An organism that uses chemical energy to produce food. Fig. 10-2.

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Photosynthesis Part 1

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  1. Photosynthesis Part 1 Pages 108 to 111

  2. Autotrophs • Name some common producers • Plants, algae, some protists, cyanobacteria • Define photoautotroph • An organism that uses light energy to produce food • Define chemoautotroph • An organism that uses chemical energy to produce food

  3. Fig. 10-2 (a) Plants (c) Unicellular protist 10 µm (e) Purple sulfur bacteria 1.5 µm (b) Multicellular alga (d) Cyanobacteria 40 µm

  4. Location of photosynthesis • State the organelle of photosynthesis • Chloroplast • Where are chloroplasts concentrated in plants? • The green tissue on the interior of the leaf • Mesolphyll

  5. Fig. 10-3a Leaf crosssection Vein Mesophyll Stomata CO2 O2 Chloroplast Mesophyll cell 5 µm

  6. Gas Exchange • Explain how gases are exchanged between the plant and the environment. • Stoma are openings in the epidermis of leaves • Guard cells surround the stoma and they regulate the opening & closing of the stoma • When open, CO2 can enter while O2 and H2O can exit

  7. Fig. 10-3b Chloroplast Structure of the chloroplast Thylakoid is site of light reactions Stroma is site of Calvin Cycle Outer membrane Thylakoid Intermembrane space Stroma Granum Thylakoid Space (lumen) Inner membrane 1 µm

  8. Plants produce O2 by splitting H2O • 1950’s – scientists used heavy isotope of oxygen (18O) to follow oxygen through photosynthesis. • Tagged oxygen of CO2 and found no tagged O2 given off • Tagged O2 of H2O and found tagged O2 given off

  9. Fig. 10-4 6 CO2 12 H2O Reactants: 6 H2O 6 O2 C6H12O6 Products:

  10. Photosynthesis is a Redox Reaction • Equation • 6CO2 + 6H2O Light C6H12O6 + 6O2 • Redox reaction of photosynthesis • Oxidized: • H2O to O2 • Reduced: • CO2 to C6H12O6

  11. Overview of Photosynthesis • Photosynthesis consists of the light reactions (photo – absorbs light energy) and the Calvin cycle (synthesis – makes sugar)

  12. 2 stages of photosynthesis Light Reactions • Takes place in the thylakoids • Split H2O • Release O2 • Reduce NADP+ to NADPH • Produce ATP via photophosphorylation • Takes place in the stroma • Forms sugar using • CO2 from atmosphere • ATP and NADPH from light reactions • Starts with carbon fixation Calvin Cycle

  13. Fig. 10-5-4 CO2 H2O Light NADP+ ADP + P i Calvin Cycle Light Reactions ATP NADPH Chloroplast [CH2O] (sugar) O2

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