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23.1 Characteristics of Fungi
  • Fungi are saprotrophic detritivores that aid the cycling of inorganic nutrients in ecosystems.
  • The body of a fungus is multicellular; it is composed of thin filaments called hyphae.
  • As an adaptation to life on land, fungi produce nonmotile and often windblown spores during asexual and sexual reproduction.
  1. How do fungi obtain nutrition?
  2. A mycelium is a network of filaments called ____________ which function to increase the _____________ to volume of the organism allowing for greater _____________ of nutrients.
  3. How are fungi like insects?
  4. In what form do fungi store food and is this more like plants or animals?
  5. What is a spore?
Essential Study Partner Summaries of major points:
  1. Fungi are multicellular eukaryotes
  2. Structure of fungi
  3. Reproduction of fungi
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23.2 Evolution of Fungi
  • Fungi are classified according to aspects of their sexual life cycle. Zygospore fungi have a dormant stage consisting of a thick-walled zygospore.
  • During sexual reproduction of sac fungi, saclike cells (asci) produce spores. Usually, asci are located in fruiting bodies.
  • During sexual reproduction of club fungi, club-shaped structures (basidia) produce spores. Basidia are located in fruiting bodies.
  • The imperfect fungi always reproduce asexually by conidiospores; sexual reproduction has not yet been observed in these organisms.
  1. How are fungal groups classified?
  2. True or False: Fungi are only able to reproduce asexually.
Essential Study Partner Summaries of major points:
  1. Evolution of fungi
  2. Zygospore fungi
  3. Sac fungi
  4. Yeasts
  5. Club fungi
  6. Imperfect fungi
Art Review
23.3 Symbiotic Relationships of Fungi
  • Lichens, which may live in stressful environments, are an association between a fungus and a cyanobacterium or a green alga. The fungus may be somewhat parasitic on the alga.
  • Mycorrhizae is an association between a fungus and the roots of a plant, such that the fungus helps the plant absorb minerals, and the plant supplies the fungus with carbohydrates.
  1. What experimental evidence suggests that the fungal/algal interaction found in lichens is not mutualistic (in which both benefit)?
  2. What benefit do plants receive from mycorrhizae and what benefit do mycorrhizae receive from plants?
Summaries of major points:
  1. Lichens
  2. Mycorrhizae
Art Review

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