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The Kingdom Fungi. Section 21-1. What Are Fungi?. Eukaryotic Heterotrophic: digest food outside of their bodies, then absorb it Cell walls made of chitin. Structure & Function of Fungi. Multicellular, except for yeast Composed of hyphae (thin filaments one cell thick). - PowerPoint PPT Presentation
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The Kingdom FungiSection 21-1
What Are Fungi?EukaryoticHeterotrophic: digest food outside of their bodies, then absorb itCell walls made of chitin
Structure & Function of FungiMulticellular, except for yeastComposed of hyphae (thin filaments one cell thick)
Structure & Function of FungiBody composed of mycelium (many hyphae tangled together)Fruiting body: reproductive structure growing from the mycelium
Reproduction in FungiMost asexually and sexuallyAsexualcells or hyphae break off and grow on their ownSpores
Reproduction in Fungi
Sexual2 different mating types: plus and minusHyphae fuse & form diploid zygote nucleusEnters meiosis and produces haploid spores
How Fungi SpreadSpores scattered by windSome lure animals to disperse sporesStinkhorns: smell like rotting meat to attract flies
Ecology of FungiSection 21-3
All Fungi Are HeterotrophsSaprobes: obtain food from decaying organic matterParasites: harm hostsSymbionts: live in close and mutually beneficial association with other species
Fungi as ParasitesPlant diseasesCorn smut: destroys corn kernelsMildewsWheat rustHuman diseasesAthletes footRingwormYeast infections