Chapter 31 Notes

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Chapter 31 Notes Fungi

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Chapter 31 Notes. Fungi. Concept 31.1. All fungi are eukaryotic; most are multicellular mycete = fungi Fungi differ from plants in nutritional mode, structural organization, growth, and reproduction. Concept 31.1. Fungi are heterotrophs that acquire their nutrients by absorption - PowerPoint PPT Presentation

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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