BIOL1993 Lecture Notes - Lecture 2: Radiant Energy, Energy Transformation, Rubisco
27 Dec 2019
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Lecture 8 energy conversion - photosynthesis i. Describe the major evolutionary events to maximise light capture by plants. 2. 5 billion years ago earliest ancestors of modern plants caused the great oxidation. Event changed composition of the atmosphere to allow life to evolve beyond microbes. Bacteria produced free oxygen (by splitting water) in the atmosphere, via photosynthesis (using energy from sun) The first land plants, about 450 million years ago o2 reacted in upper atmosphere to produce ozone uv protection plants could start colonising land. 400 million years ago plants widespread on land but still very simple morphology. Describe, in overview, the conversion of radiant energy into chemical energy. Energy reaching the earths surface 13 x 1023 calories per year. 2/3 absorbed by earth"s surface (mostly converted to heat) 1% of energy converted to chemical potential energy by plants lomoarcpsd|1668352. Explain the overall organisation of the light reactions in photosystems i and ii.
