CAS BI 306 Chapter Notes - Chapter 4: C4 Carbon Fixation, Quantum Yield, C3 Carbon Fixation
11 Feb 2018
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Document Summary
Gradual decreasing levels of co2 in the atmosphere during miocene era led to co2. Starvation of c3 plants in tropical and subtropical regions. C4 plants are less sensitive to co2 levels than c3 plants. Changes in fauna and flora at the end of miocene are thought to attributed to changes in aridity. Changes in atmospheric co2 concentrations and conditions like aridity may be important to ecosystem change and consequences for evolution of terrestrial mammals. Volcanism injected co2 into atmosphere while weathering and photosynthesis and burial of carbon in the oceans led to the extraction of atmospheric co2. Describes weathering and the sink of carbon to the oceans forming carbonate sediments. H2o + co2 = ch2o + o2. These reactions cause net co2 decrease in atmosphere because co2 is converted to solids (limestone or organic deposits) Co2 levels in interglacial periods measured by preserved bubbles in ice cores show that. 270 ppm pre industrial era to over 400 ppm today.
