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Lecture 16

BI111 Lecture Notes - Lecture 16: Green Algae, Food Web, Lignin


Department
Biology
Course Code
BI111
Professor
Tristan Long
Lecture
16

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LAND PLANTS Feb 8, 2016
Ancestral derived does not mean Primitive/Advanced
oDoes not mean advanced if at the tip of a branch
oCloser branches = closer recent ancestors ex. Family tree
Importance of Land Plants
oAre an imp evol event
oInu terrestrial and aquatic and atmos conditions
oNew enviro niches
oPhylo range is big
oImp to todays eco processes
oEat them in food web, domesticate them
oLife would be fundamentally di& without them
Land Plants Evolved in Ordovician period
oMoist enviro and mild
oCyano bac se water as reducing agent make o2 bt co2 was still greater
Origin of Land Plants
oGreen algae and land plants similarities are not many
oMulticellular
oA and b chlorophyll
oStore sugar as starch like today
oGreen algae : no roots for transportation b/c of location in water, oating
oLand plants: roots for transport and anchoring
Challenges and Opportunities
Aquatic to land why?
oLess competition on land for food
oSunlight
oAlgae is limited in light absorption b.c of water
oAir is less absorbent of light than water good opp for plants to get light for photosynthetic
purposes
Challenge one
oDryness
oWater content is not as accessible, can only grow in moist areas
oAlgae use water to spread gametes reproduction
oAdaptations
oCuticles
Barrier
oStomata
Exchange
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