Demo7_TakeHomeAssignS10 - LS1 Week 7 Animal Diversity 1...

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Unformatted text preview: LS1 Week 7 Animal Diversity 1 Name_________________ uid___________________ All answers must be in your own words. Copying from the textbook, lab manual, lecture notes, or another student is plagiarism. 1. Fungi are defined by their ability to break down compounds into the nutrients they need and then absorbing the nutrients across their cell wall a. In a world without fungi, how would the decomposition of plant material be affected? Would this harm or help plants? b. Instead of male and female gametes, fungi have multiple mating types. Explain why this is so. 2. Porifera filter food from the water and ingest it with choanocyte cells. a. The water enters the sponge through many small incurrent openings and exits through fewer, larger excurrent openings. Why in this arrangement beneficial for filter feeding? 3. Cnidarians typically alternate between an asexual, sessile polyp phase and a sexual, mobile medusa phase. a. Is this the same or different than the alternation of generations seen in protists and plant? Why or why not? b. Describe how you would test the hypothesis that a corals inherit their algal symbionts from their parents (as they do their mitochondria), vs the alternative that they must acquire the symbionts from the environment. 4. You have compared the difference between free living and parasitic flatworm species. a. In which group, the parasites or the free living species, would you expect the sensory systems to be the most well developed? Why? b. A single tapeworm segment can contain 50,000 eggs, and there can be thousands of segments/individual. Why do these parasites need to produce so many eggs as part of their life cycle? 5. How is the segmentation in annelids different than the segmentation in tapeworms? (Hint: think about structures that go across or through segments. Which group do you find those in?) ...
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This note was uploaded on 06/03/2011 for the course LS 1 taught by Professor Thomas during the Spring '05 term at UCLA.

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