BISC 101 Lecture Notes - Lecture 8: Main Stem, Storage Organ, Phloem
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30 Jan 2018
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The z scheme model links photosystem i & ii- follow the linear path of electron flow. Electrons lost from ps ii are replaced by splitting of water ( h+ ions are released in thylakoid lumen) Plastocyanin (pc) transfers electrons from cytochrome of ps ii to ps i. Outputs of light capturing reaction = atp and nadph (and o2) key products. Summary = the light capturing reactions transform light energy to chemical energy to form atp and nadph light dependent . The reactions that produce sugar from o2 are not directly light dependent = calvin cycle. Calvin cycle is anabolic = build complex cho from smaller molecules and costumes energy one turn of the cycle xes 1 co2. Three turns of the cycle produces 1 x g3p ( available to the plant) Photosynthesis requires co2 that enters via stroma on leaf. but storm are main route fro evaporative loss of water via transpiration.
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