Biology
Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 58, Problem 3TY

Which evidence suggests that more diverse communities are more stable than less diverse communities?

  1. a. Agricultural land, with fewer species, undergoes less frequent pest outbreaks than natural prairies containing more species.
  2. b. In Australia, introduced rabbits frequently assume pest proportions. In Europe, coevolved predators such as foxes prevent rabbit populations from reaching pest proportions.
  3. c. Long-term studies of American grasslands show fields with high numbers of plant species vary less in biomass from year to year.
  4. d. Both a and b are correct.
  5. e. Both b and c are correct.
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Rabbits are important grazers, maintaining some important grassland habitats. If a catastrophe were to reduce rabbit populations what would happen? * a. There would be more grass for the surviving rabbits b. The grassland would be invaded by trees and shrubs c. All of the above
Whichstatement about organisms’ “niches” is false?a.The niche summarizes environmental factors influencing growth, survival,and reproduction of a species.b.The niche concept was developed by Joseph Grinnell and Charles Elton.c.The “fundamental” niche refers to physical, but notbiological, aspects of the environment.d.Interactions such as competition and parasitism may restrict the size ofan organism’s niche.e.In the laboratory, two species with identical niches are especially easyto maintain in a mixed culture.
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