EE BIOL 100 Study Guide - Final Guide: Stomatal Conductance, Aspen Grove, Photosynthetically Active Radiation

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Nep = gpp - (r plant + r heterotrophs + r decomposers) Autotrophs ultimate source of carbon from which life is constructed; photoautotrophs use sunlight > organic molecules from co2 & h2o. Chemoautotrophs (use oxidation of inorganic > organic substances) Light reaction @ thylakoid membrane (chlorophyll with magnesium center); produce o2, atp (photosystem 2), nadph (photosystem 1) > glucose & starch; most energy used to make more rubp. Photorespiration when rubisco catalyze reaction b/w o2 & rubp > waste 25% energy (high temp, high [o2], low [co2]) Net p/s=0 > light compensation pt. (co2 uptake = co2 respiration loss); photosynthetically active radiation inc. until light saturation point. Co2 moves in from atmosphere to leaf through stomata (in terrestrial plants) driven by diffusion gradient. Larger diffusion gradient from lower relative humidity of air. Stomatal conductance = flow rate of co2 thru stomata, stomatal density = # per unit leaf sa, aperture = size of stomatal openings.

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