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Ch. 29 - Fungi

Chapter 28, Problem 10

Many mushrooms are extremely colorful. One hypothesis is that the colors serve as a warning to prevent animals from eating mushrooms, much like the bright yellow and black stripes on wasps help to deter potential predators. Design an experiment to test this hypothesis.

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Hello, everyone here. We have a question telling us a researcher paint some white mushrooms bright yellow and then distributes both the white and yellow painted mushrooms to three squirrels. Independently observed that all three squirrels ate only white mushrooms. What can you conclude from this observation? A The squirrels are adapted to eat white mushrooms. This is incorrect. They are just familiar to the white mushrooms. They are adapted to eat white mushrooms. Be the bright yellow color could be acting as a deterrent to squirrels. This is true, and it would be like the bright yellow and black stripes on wasps. The yellow color deters potential predators. See the squirrels do not like yellow color mushrooms. This is just a statement, not a conclusion. So seeds incorrect and D None of the above is incorrect. So our answer here is B The brightly yellow color could be acting as a deterrent to squirrels. Thank you for watching. Bye.
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A particular cell type spends 4 hours in G1 phase, 2 hours in S phase, 2 hours in G2 phase, and 30 minutes in M phase. If a pulse–chase experiment were performed with radioactive thymidine on an asynchronous culture of such cells, what percentage of mitotic cells would be radiolabeled 9 hours after the pulse? a. 0 percent b. 50 percent c. 75 percent d. 100 percent

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Table 29.1 mentions that chytrids are responsible for massive die-offs currently occurring in amphibians. Review Koch's postulates; then design a study showing how you would use Koch's postulates to test the hypothesis that chytrid infections are responsible for frog deaths.

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When a fruit fly embryo first begins to develop, a large cell is generated that contains over 8000 genetically identical nuclei. What is most likely responsible for this result?

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Textbook Question

Some fungi have elaborate mechanisms for dispersing spores. For example, the 'squirt gun' fungus Pilobolus, which grows in cow dung, forcibly shoots off tiny black sporangia filled with spores. Any sporangia that are flung onto fresh grass are likely to be eaten by a grazing cow, passed through its digestive system unharmed, and deposited in a new batch of dung. The spores carried within the sporangia are perfectly positioned to grow into a new mycelium. Pilobolus is a zygomycete, and the sporangia just described produce asexual spores. In contrast, which of the following best describes what happens during the sexual phase of its life cycle? a. It produces eight ascospores in each ascus. b. It produces basidiospores that grow into mushrooms. c. It produces motile sperm and eggs. d. Hyphae from two compatible mating types fuse and form a zygosporangium.

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Textbook Question

Both asexual sporangia (shown in the photo) and zygosporangia can be found in cow dung. Make a simplified drawing that illustrates the events of plasmogamy, karyogamy, and meiosis that occur during sexual reproduction in Pilobolus. Be sure to indicate and label the zygosporangium.

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Textbook Question

Would you describe the association between Pilobolus and cows as a symbiotic relationship? Explain your answer.

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