BIO120H1 Lecture Notes - Lecture 6: Vascular Bundle, Leaf, Photic Zone
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BIO120H1 Full Course Notes
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6. 0 adaptations to the physical environment: light, energy, and heat. Organisms use spatial and temporal variation in environment to lose excess heat without having to use the most limiting resources such as water. Ability to counteract external physical forces distinguishes the living from nonliving: e. x. bird in flight expending energy to maintain itself aloft against pull of gravity. 6. 1 plants modify photosynthesis in environments with high water stress. C4 photosynthesis: problem of photorespiration have modified c3 photosynthetic process co2 joined with phosphoenol pyruvate to produce oxaloacetic acid, co2 + pep oaa. Another enzyme breaks it down to produce co2 and pyruvate co2 used in light reactions to make g3p. Some energy produced by light reactions is used up in c4 carbon assimilation reactions. Carbon assimilation in cam plants: crassulacean acid metabolism (cam)- c4 process but segregate co2 assimilation and. Open stomates for gas exchange during night when transpiration is minimal.
