Evolution and diversity of plants

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…