11. Fungi short - 1 2 Which kinds of organisms came on to...

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1 1 Which kinds of organisms came on to the land first? • Terrestrial fungi, plants, and animals evolved from freshwater aquatic organisms – why? • The first multicellular organisms on land were probably fungi – what did they feed on? 2 How do fungi feed themselves? All members are heterotrophs Feeding is absorptive, and involves external digestion Cell walls are made of chitin Fungi may be unicellular (yeasts) or more commonly form colonies of filaments called hyphae 3 Hyphae may be coenocytic, septate with one nucleus or septate with two nuclei The walls of true fungi are made of chitin 4 A mass of hyphae is called a mycelium 5 Fairy rings result as fungal colonies spread outwards, having depleted the nutrients in the center of the circle 6 How does sexual reproduction take place in terrestrial fungi? • Hyphae of different genotypes fuse • Nuclei may remain separate, two per cell, during the extended growth of a dikaryotic mycelium
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11. Fungi short - 1 2 Which kinds of organisms came on to...

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