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63. The intermediate disturbance hypothesis predicts that A. Maximum population

ID: 265726 • Letter: 6

Question

63. The intermediate disturbance hypothesis predicts that A. Maximum population size occurs at intermediate levels of disturbance. B. Maximum species richness occurs at intermediate levels of disturbance. C. The climax community occurs at intermediate levels of disturbance. D. All of the above. ive is unable to establish itself in a meadow community because the roots of other 64. A weed that is ordinarily invas plant species produce chemicals that retard its growth. This is an example of a. resource partitioning. c. resilience. d. competitive displacement. b. biotic resistance. 65. Suppose that the net primary productivity (NPP) of a particular ecosystem is 80 units per year. The respiration rate primary producers is 30 units per year, productivity (GPP) is and the respiration rate of herbivores is 10 units per year. The gross primary units per year. a. 40 b. 50 c. 70 d. 110 66. In which biome would you most likely see the greatest percentage of NPP devoted to roots? a. Pine savannas in Belize b. Tundra in Alaska c. Boreal forests in Russia d. Tropical forest in Panama stimates of NPP? 67. Which of the following is NOT an advantage of remote sensing technologies over harvesting e a. They can provide more frequent estimates. b. They can provide more accurate estimates. c. They can be used over a greater area. d. They do not cause destruction of the area.

Explanation / Answer

63. B. Maximum species richness occurs at intermediate level of disturbance.

According to Intermediate disturbance Hypithesis, at an intermediate levels of disturbance, species diversity and hence species richness is maximized because species that thrive at both early and late successional stages can coexist.

64. B. Biotic resistance.

Biotic resistance is the ability of a native community to keep out invasive species.

65. D. 110.

NPP = GPP - R.

Therefore GPP = NPP + R.

66. B. Tundra in Alaska.