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Photosynthesis lecture gr 9

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 Chloroplast and chlorophyll Photosynthesis  Absorption of Light Photosynthesis is the process that converts solar energy to chemical energy. It nourishes almost the entire living world, directly or indirectly.  Redox Reaction  Light Reaction  Dark Reaction Organisms that can produce their own food are called autotrophs. Examples are producers. Heterotrophs, like animals and human , depend on heterotrophs for food and O2, and on other animals that directly feed on heterotrophs. Almost all plants are photoautotroph; that is they use energy from sunlight to make organic molecules from H2O and CO2.  (a) Plants (c) Unicellular protist 10 µm (e) Purple sulfur bacteria (b) Multicellular alga (d) Cyanobacteria 1.5 µm 40 µm Chloroplasts and Chlorophyll In prokaryotes, such as cyanobacteria, photosynthesis takes place in granules bound to plasma membrane. In eukaryotes, such as green plants and green algae, the site of photosynthesis is the chloroplast. Leaves are the major locations of photosynthesis. The pigment chlorophyll, which gives it the green color., is found within the chloroplasts. Figure 1. Photosynthesis can also occur in algae, certain other protists, and prokaryotes. Parts: • mesophyll - interior tissue of the leaf • thylakoid - sheet-like membrane-bound structure that is the site of the light reaction • granum - stack of thylakoid (pl. grana) • stroma - dense fluid that lies within the inner membrane and outside the thyla ...
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