BY 124 SI worksheet 6: Fungi 1. Fungi: a.
b.
c.
d.
Are heterotrophic organisms that get their nutrition directly from photosynthesis Secrete hydrolytic exoenxymes that absorb nutrients from living hosts Are often saprobes that absorb nutrients None of the above 2. Parasitic fungi have modified hyphae called _________, which penetrate and absorb nutrients from host tissues. a. Haustoria b. Mycelia c. Asci d. Basidia e. None of the above 3. In contrast to plans, the cells walls of fungi are composed of _______. a. Lignin b. Peptidoglycan c. Cellulose d. Chitin e. Pectin 4. The fact that karyogamy and meiosis do not immediately follow Plasmogamy a. Is necessary to create Coenocytic hyphae b. Is characteristic of all fungi c. Allows fungi to produce asexually most of the time d. Results in heterokaryotic cells that may benefit from the variation present in two genomes e. Is characteristic of yeasts 5. The traditional group deuteromycetes a. Represents the most ancient lineage of fungi b. Includes the fungal components of lichens c. Has abnormal forms of sexual reproduction d. Consists of fungi that are predatory e. Consists of fungi whose sexual stage is absent or unknown 6. Which of the following statements accurately describes ascomycetes? a. Sexual reproduction occurs by conjugation b. Spores often line up in a sac in the order in which they were formed by meiosis c. Asexual spores form in sporangia on erect hyphae d. Most hyphae are dikaryotic e. Reproduction is always sexual 7. Lichens are symbiotic associations that a. Usually involve an ascomycete and a green algae or cyanobacterium b. Can reproduce sexually by forming soredia c. Require moist environments to grow d. Fix nitrogen for absorption by plant roots e. Are unusually resistant to air pollution What is the difference between dikaryon and heterokaryon? Fill out the following table. Fungal Phylum Distinguishing Features Chytridiomycota Zygomycota Glomeromycetes Ascomycota Basidiomycota Briefly describe the following terms: Septa – Coenocytic – Karyogamy – In what ways to mycorrhizal fungi benefit plants? In what ways do plants benefit the fungi?