Chapter 10

Chapter 10 - Chapter 10 Photosynthesis converts light...

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Chapter 10 Photosynthesis converts light energy to chemical energy of food. Autotrophs are “self feeders” or producers that don’t eating anything derived from other organisms. They produce their organic molecules from CO2 Heterotrophs are consumers that are unable to make their own food, and they live on compounds produced by other organisms. Chloroplast is present in a vairety of photosynthesizing organisms. Chlorophyll is the green pigment located within chloroplasts. The light energy absorbed by chlorophyll drives the synthesis of organic molecules in the chloroplast. Mesophyll is the tissue in the interior of the leaf, and it’s where chloroplasts are mainly found. Typical mesophyll cell has 30-40 chloroplasts. Stomata (“mouth”) are microscopic pours by which CO2 enters and O2 enters the leaf. Stroma is the dense fluid within the chloroplast Thylakoids are flattened membrane sacs inside the chloroplast, used to convert light energy into chemical energy. Photosynthesis vs. cellular respiration – Both involve redox reactions, but photosynthesis reverses the direction of electron flow. Water is split, and electrons are transferred along with hydrogen ions from water to carbon dioxide, reducing it to sugar. Because electrons increase in potential energy as they move from water to sugar, this process requires energy. This energy boost is provided by light. 2 stages of photosynthesis are light reactions ( photo part) and the Calvin cycle ( synthesis part). Photosynthesis is a redox process: H20 is oxidized, CO2 is reduced. The light reactions in the grana spit water, releasing O2, producing ATP, and forming NADPH. The
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This note was uploaded on 04/17/2008 for the course BILD BILD 1 taught by Professor Bever during the Winter '08 term at UCSD.

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Chapter 10 - Chapter 10 Photosynthesis converts light...

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