A.P. U.S. History Notes Chapter 31: “American Life in the ‘Roaring Twenties’” ~ 1919 – 1929 ~
Chapter 31 Notes
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Transcript of Chapter 31 Notes
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Chapter 31 NotesFungi
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Concept 31.1All fungi are eukaryotic; most are
multicellularmycete = fungiFungi differ from plants in nutritional
mode, structural organization, growth, and reproduction
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Concept 31.1Fungi are heterotrophs that acquire
their nutrients by absorption- fungi digest their food outside their body by secreting powerful hydrolytic enzymes (exoenzymes) into the food.- decomposers, parasites, and mutualistic symbionts
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Concept 31.1Fungi have a large surface area and
grow rapidly to assist with absorption
The bodies of fungi are constructed of tiny filaments called hyphae- the hyphae are divided into cells by cross-walls, or septa- cells walls are made of chitin
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Concept 31.2Fungi disperse and reproduce by
releasing spores that are produced sexually and asexually- heterokaryotic stage: fusion of two hyphae that have genetically different nuclei
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More than 100,000 fungi species are known; estimated that 1.5 million may exist
Phylum Chytridiomycota:- chytrids are mainly aquatic- saprobes or parasites- most primitive fungi; ancestors of protists
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Phylum Zygomycota:- mostly terrestrial; live in soil or on decaying plants and animals- many form mycorrhizae, a mutualistic association with the roots of plants
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Phylum Ascomycota:- sac fungi- range from unicellular yeasts to cup fungi- produce spores in saclike asci
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Phylum Basidiomycota:- “club fungus”- mushrooms, puffballs, and rusts- important decomposers of wood and other plants
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Concept 31.5Molds, yeasts, lichens, and
mycorrhizae have specialized lifestyles
Molds- a rapidly growing, asexually reproducing fungus
Yeasts- unicellular fungi that inhabit liquid or moist habitats
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Concept 31.5Lichens
- symbiotic relationship of millions of photosynthetic microorganisms (alga) held in a mesh of fungal hyphae- the alga provides the fungus with food. The fungus provides a suitable environment for growth
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Concept 31.5Mycorrhizae
- mutualistic association of plant roots and fungi- responsible for making nutrients able to be absorbed
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