Chapter 18: Community Structure Communities can have distinct or gradual boundaries

Chapter 18: Community Structure Communities can have distinct or gradual boundaries. 1. Which concept suggests that a community is much more than the sum of its individual parts? a. holistic concept b. individualistic concept c. concept of independence d. ecotone concept Answer: a 2. Which concept suggests that a community is a collection of species whose adaptations and requirements enable them to live together under the physical and biological conditions of a particular place? a. holistic concept b. individualistic concept c. concept of independence d. ecotone concept Answer: b 3. How does an ecologist determine the presence of an ecotone? a. measure the abundance of plant species over space and abrupt changes in species composition b. perform controlled crosses among all plant species within a community to determine the extent to which the species are reproductively isolated c. measure microclimate and soil variables for abrupt changes d. measure elevation, since many environmental and ecological variables change with elevation Answer: a Use the figure to answer questions 4 to 7. 4. Which species would you characterize as seemingly unresponsive to changes in soil conditions across the transect? a. black oak b. hawkweed c. ragwort d. fireweed Answer: b