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14 - BIO LECTURE NOTES Fungi The angiosperm radiation o...

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BIO LECTURE NOTES (2/6/09) Fungi The angiosperm radiation o Angiosperms represent one of the great adaptive radiations in the history of life o The diversification of angiosperms is associated with three key adaptations: (1) vessel elements, (2) flowers, and (3) fruits. o These adaptations have a lowed them to be dispersed in many environments o On the basis of morphological traits, angiosperms have traditionally been divided into the two major groups anmed monocots and dicots Monocots have one cotyledon, the first leaf, while dicots have two Monocots as a group are monophyletic; dicots are paraphyletic. Because dicots are not a natural grouping, most biologists call them eudicots o Monocots vs. dicots: o remember that angiosperms and gymnosperms were the last to evolve in alternation of generations sexual reproduction produces offspring that are genetically different from their parents multicellularity if associated with differentiation among gene expression multicelluarity evolved several times as protists diversified protists play a key role in the global carbon cycle and act as carbon sinks fungi o the vast majority of fungi that live in association with other organisms benefit their hosts and are mutualists
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o some fungi absorb nutrients from their hosts, lowering the hosts’ fitness and acting as parasites o extracellular digestions fungi synthesize and secret enzymes this process if called extracellular digestion
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