Photosynthesis Page 3

Light Reactions of Photosynthesis

• V. The "Z" Scheme
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• A. Photosystem I & II = harvest light energy
• 1. Thousands of pigment molecules in thylakoid membranes
• 2. Absorption of photons raises energy level of pigment molecules
• 3. Pigment molecule returns to ground state when energy is released in the form of heat and electrons.
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