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Photosynthesis
Section 8.2
Photosynthesis
• The process by which plants convert light energy into chemical energy in the form of carbohydrate (sugar).
• 6CO2 + 6H2O →Light Energy (sun)→ C6H12O6 + 6O2
2 Stages of Photosynthesis• Occurs in a plant’s chloroplast which is GREEN.
• The green pigment’s name is chlorophyll.
• Takes place in Two Stages.
Stage 1: The Light-Dependent Reactions
• Light strikes chlorophyll, energizing an electron.
• The high energy electron moves through a series of reactions called an electron transport chain.
• The electron transport chain makes ATP and NADPH for the next stage.
• Water breaks down– The H replaces the one lost by chlorophyll– The O2 is released as gas
Stage 2: Light-Independent Reactions
• CO2is absorbed by the leaves.• ATP and NADPH (from the light reactions)
donate their electrons.• The electrons combine carbons from the CO2
in a series of reactions to eventually make one glucose molecule.
• SWEET!
Photosynthesis - Recap
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