CPSC 112 Lecture Notes - Lecture 6: Radiant Energy, Stoma, Photosynthesis
14 Sep 2018
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Document Summary
Primary producers create biomass from inorganic compounds (autotrophs) Remember how sugar and oxygen is created. Biggest annual fluxes are photosynthesis and respiration (16% of atmospheric c) Environmental changes allow for a release of deep ocean carbon and other natural cycles to be negatively impacted. Heterotrophs respire organic carbon to gain energy (95% of all living organisms. Three steps: co2 enters leaf by diffusion, light energy is captured through a photochemical process (light-dependent, carbon assimilated through a biochemical process a (light-independent) Part one (1) - co2 enters leaf by diffusion. Fundamental tradeoff - co2 in, water out. Guard cells tend to open stomata during the day when there is lots of sunlight and close stomata at night when the sun is not present. They will also close stomata if the air is dry or hot, which minimizes water loss through evaporation. Empty air space inside of the leaf. Co2 goes through the stoma and into the chloroplast.
