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September 25-ch7

September 25-ch7 - o Leaf anatomy • Stoma are openings...

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September 25, 2007 Chapter 7 Photosynthesis: harvesting solar energy What is photosynthesis? o Early cells evolved the ability to perform photosynthesis about 2 billion years ago o Photosynthesis is the ability to capture sunlight energy and convert it to chemical energy o Most forms of life on earth depend on the chemical energy produced by photosynthetic organism The photosynthetic equation 6CO 2 + 6 H 2 O + light energy C 6 H 12 O 6 + 6 O 2 Early forms of life were not adapted to free oxygen in the atomosphere Photosynthesis occurs in plants, algae, and some prokaryotes Photosynthetic organisms are autotrophs Photosynthesis in plants occurs with chloroplasts Gases, sugar, and Water cycle Photosynthesis and respiration are interconnected Adaptations for Photosynthesis Leaves Chloroplasts Leaves o Flattened leaf shape exposes large surface are to catch sunlight o The epidermis comprises the upper and lower leaf surfaces of a leave o Waxy, waterproof cuticle on outer surfaces reduces water evaporation
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Unformatted text preview: o Leaf anatomy • Stoma are openings for Co2 Location of photo synthetic reactions • The convesion of sunlight energy to chemical energy occurs on the thylokoid membranes Two groups of reactions • Light dependent o Cholorphyll and other molecules of the thylakoids capture sunlight energy o Sunlight energy is converted to the energy needed for photosynthesis to happen • Light independent o Enzymes in the stroma synthesize Light dependent reactions • Capture of light by pigments • Light dependent reactions is thylakoid membranes o Photosystem II generates ATP o Photosystem I generates NADPH The energy in visible light • Visible light is radiation fall between 400-750 nanometer Light captured by pigments • Absorption of certain wavelengths • Reflection allows us to see the leaves Why autumn leaves turn color • Chlorophyll breaks down before carotenoids • Page 120...
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September 25-ch7 - o Leaf anatomy • Stoma are openings...

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