Ch3 Adaptations to the Physical Environment5.pdf

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University of Toronto St. George
University College Courses
Spencer Barrett

 every surface of an aquatic plant, alga, or microbe is surrounded by a boundary layer of unstirred water through which C must diffuse -  thus, despite high conc. of HCO , p3otosynthesis is limited by C availability  once inside plant cells, HCO ca3 be used directly as a source of C (not as eff. as CO ) 2  as CO is taken up from water during photosynthesis, HCO ions associate with H ions to + 2 3 produce more CO 2  H + HCO  3O + H O2 2 -  HCO i3ns and CO exis2 in chemical equilibrium Oxygen  oxygen has low solubility in water (21% in air, 1% in water at 0°C in fresh water)  low rate of diffusion  below photic zone, no oxygen produced by photosynthesis  become ananaerobic anoxic  terrestrial plants that live in waterlogged habitats (ex. bald cypress trees, mangroves) have special vascular tissues extending from the roots that conduct air directly from the atm. Temperature Limits the Occurrence of Life  NRG from sun creates temp. conditions required by life  45°C is the upper limit for most eukaryotic organisms Heat and Biological Molecules  heat affects organic molecules which in turn affect physiological processes of orgnms  imparts a high kinetic NRG to living systems (causes biological molecules to move and change their shapes rap
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