1 / 18

Ch 21 Protists and Fungi

Both bacteria and fungi are decomposers. What characteristics do these two groups share that allow them to function in this ecological role- you may want to use information from 21.2. Ch 21 Protists and Fungi . 21.4 Fungi. What Are Fungi.

luther
Download Presentation

Ch 21 Protists and Fungi

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Both bacteria and fungi are decomposers. What characteristics do these two groups share that allow them to function in this ecological role- you may want to use information from 21.2

  2. Ch 21 Protists and Fungi 21.4 Fungi

  3. What Are Fungi • Heterotrophic eukaryotes with cell walls that contain chitin • Produce enzymes that digest food outside their bodies • Absorb the small molecules released by the enzymes • Can be decomposer or parasite.

  4. Hyphae Long, slender branching filaments 1-2 nuclei Openings in cross walls allow for cytoplasm movement. Structure and Function

  5. Fruiting body Reproductive structure of the fungus What we call the mushroom Mycelium Mass of branching hyphae below the soil that fruiting body grows from Often has many mushrooms.

  6. Asexually Releasing spores that travel through air and water Breaking off a hypha or budding off a cell. Reproduction

  7. Most can also use sexual reproduction.

  8. One mating type is called “+” (plus) and the other “–” (minus) Think male and female for people Hyphae of opposite mating types fuse together.

  9. The + and – nuclei form pairs that divide Many paired nuclei fuse to form diploid zygotes within zygospore.

  10. Zygospore germinates and a sporangium emerges Sporangium reproduces asexually, releasing haploid spores produced by meiosis.

  11. Parasitic fungi cause diseases that threaten food crops • Others affect animals • Athletes foot • Yeast infections

  12. Lichens • Mutualistic relationship between fungus and a photosynthetic organism (green alga or cyanobacterium) • Grow where few other organisms can • Green algae or cyanobacteria provide energy, fungus provides water and minerals and structure • Often pioneer species.

  13. Mycorrhizae • Mutualistic relationships with fungi and plant roots • Hyphae collect water and minerals • Also release enzymes that free nutrients in the soil • Plant roots provide energy • 80 to 90 percent of all plant species form this relationship.

  14. By what percent is the mycorrhizae lemon tree taller than the non mycorrhizae lemon tree Make a generalization about the growth rate of plants with mycorrhizae A citrus grower began using sterilized soil for repotting lemon trees with the goal of reducing disease. But many of the trees are dying in the new soil. Form a hypothesis to explain this observation

  15. Structure of Bread Mold • Touch the sticky side of a 2 cm piece of transparent tap to the black fussy area of a bread mold • Gently stick the tape to a glass slide. Observe the slide under the microscope. Sketch your observations. • Wash you slide with soap and water and return the slide. Be sure to wash YOUR hands as well.

  16. Observe Describe the structures you observed in the bread mold • Form a Hypothesis What do you think the function of the round structures is? Why might it be advantageous for a single mass of bread mold to produce so many of the round structures • Infer How do your observation help explain why molds appear on foods even in very clean kitchens

More Related