Evolution and diversity of plants

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Biological diversity - evolution and diversity of plants

  • first organisms = chemoautotrophs
  • eukaryotic cells formed - endosymbiosis
  • mitochondria - prokaryotic cell, engulfed smaller oxygen using bacteria. use organic compounds - aerobic respiration 
  • chloroplasts - engulfing cyanobacterium like organism 
  • centrioles - almost identical - basal bodies, flagella - some bacteria 
  • photosynthesis needs pigments - harvest light. arisen - pigments - protect from UV light
  • pigments funnel light energy - 2 reaction centres - differ - form of electron transport. 2 together give enough oxidising power - split water - oxygen = released
  • aerobic photoautotrophs enriched environment - oxygen 
  • anaerobic microorganisms = relegated - oxygen free+extreme environments
  • utilise oxygen - able exploit huge potential - gain energy 
  • ability - use oxygen - rise - evolution - eukaryotes 
  • higher plants+animals evolved - aerobic photoautotrophs+aerobic heterotrophs
  • photosynthetic eukaryotes - algae+land plants 
  • land plants originated - green algae (chlorophyta) 470-430 million years ago
  • multicellular organisms - als form - flat cheets (thalloid). 2+ layers - cells - differences between internal+surface…

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