2. North American tall-grass prairies have declined for all of the following reasons except:A. reintroduction of the bison has prevented mature species (trees) from displacing grassesB. suppression of wildfires has resulted in a decline in soil nutrientsC. introduction of cattle to the prairies has led to overgrazing of the native grassesD. intensive agriculture, using the plow, has increased soil erosionE. excessive nitrogen gases, primarily from automobile exhaust, have reduced biodiversity

The tallgrass prairie is an ecosystem native to central North America. There are various reasons for…

Answered: 2. North American tall-grass prairies…

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter55: Biodiversity And Conservation Biology

Section: Chapter Questions

Problem 4TYK

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29. According to the Costa Rica Rainforests Outward Bound School, the rain forests of the world are disappearing at a rate of 80 acres per minute, day and night. In December 2000, 53,694,993 acres of rain forest were destroyed. Which of the following facts about rain forests illustrates the negative effect of their destruction on the environment? A. The soil of the rain forest is low in nutrients, so farmers cannot reuse the same land every year. B. Ranchers clear and use the land for pastures for their cattle because land is inexpensive. C. Trees from the rain forest are used to supply the growing population with lumber for homes and furniture. D. The release of carbon dioxide into the air during the burning of the rain forests adds to the greenhouse effect. E. Almost half of the tropical rain forest deforestation occurs in South America.
2. What grass species would you recommend in the following areas: a. Plain, dry, fertile, and accessible area; can be irrigated; humid tropical environment; grass for green chop feeding and intensive utilization. b. Plain, wet, or water-logged area; humid-tropical environment; grass for grazing or cutting. c. Sloping and marginal (low fertility) area; humid-tropical environment; grass for grazing or cutting.
b. After a forest fire O c. After a drought ) d. After snow melts in the spring 6. In which scenario would secondary succession occur? a. After a volcanic eruption b. After a forest fire O c. After a drought O d. After snow melts in the spring 7. Fill in the blanks: succession happens more qu a. Primary, there is no soil. b. Primary, there is soil already. nis no soil
4. Which of the following restoration processes is starting to improve the Florida Everglades? A. more stringent laws to control pesticide and fertilizer use have cut down on pollution B. development projects have drained portions of the Everglades for farms and urban use C. flood controls on water entering the Everglades have reduced levels of fresh water D. diversion of water from the Everglades to coastal cities has reduced stream diversity E. invasive species (like the Burmese python) are competing with native species
1. Explain what environmental factors (biotic and/or abiotic) would most likely affect the differences between the Mohn Hill Natural Area and Snyder-Middleswarth Natural Area?
1. Cheatgrass (Bromus tectorum) is a species of fire-adapted grass that was Introduced by humans to the western United States in the 1880's. Fire-adapted specles not only survive frequent fires, some require fire to release nutrlents or allow seeds to germinate. The Great Basin Desert is characterized by sagebrush and cold temperatures. The Mojave Desert is characterized by creosote bush, cacti, and yucca plants and very hot temperatures. Both deserts get very infrequent ralnfall. Deserts are not fire- adapted ecosystems. Since Cheatgrass was introduced, It has invaded both the Great Basin and Mojave Deserts, where fires now occur as often as every 3 to 6 years. Select any statement that is likely to be true regarding the effects of the inrtoduction of cheatgrass. Fires destroy cheatgrass and halt its invasion. Desert plants will rapidly adapt to frequent fires. Cheatgrass seeds survive and spread with each fire cycle. The frequent fires help cheatgrass expand its range. Natural…
1.Modern agroecosystems differ from natural ecosystems in all of the following ways except: A. they attempt to suppress ecological succession by allowing only pioneer species to thrive B. they tend to raise crops in multiculture rather than monoculture (a single species) C. they tend to plant crops in neat, orderly rows rather than complex spatial arrangements D. they make the food chain less complex, so that lower species diversity results E. they (the artificial ecosystems) tend to be less complex than the natural ecosystems
1. Forests can affect their local areas favorably in all of the following ways except: A. causing sunlight to be absorbed, warming the canopy (by the green leaves of trees) B. causing wind velocity to decrease (by the "surface roughness" of trees) C. causing CO, to be removed from the air (by oxygenic photosynthesis in trees) D. causing increased soil erosion (by tree roots releasing water into soils) E. causing O2 to be released into the air (by oxygenic photosynthesis in trees)
Soil in _______ is richest in carbon. a. the arctic b. the tropics c. temperate zones
Primary productivity on land is affected by _______. a. nutrient availability c. temperature b. amount of sunlight d. all of the above
28. Forests can affect their local areas favorably in all of the following ways except: A. causing sunlight to be absorbed, warming the canopy (by the green leaves of trees) B. causing CO, to be removed from the air (by oxygenic photosynthesis in trees) C. causing O, to be released into the air (by oxygenic photosynthesis in trees) D. causing decreased soil erosion (by tree roots absorbing water from soils) E. causing wind velocity to increase (by the "surface roughness" of trees)
29. In some parts of the world, forests are being cut down and burned to clear land for new homes and new farmland. A negative effect of these activities might be A. an increase in edge effect B. a decrease in the average temperature of the atmosphere C. an increase in biodiversity of the deforested areas 30. Which action by humans could improve the quality of the air? A. building homes that use only oil (fossil fuel) furnaces for heat B. buying cars that get more miles per gallon of gasoline C. increasing the number of coal-burning power plants that generate electricity D. cutting down forests to clear land for factories 31. Which action shows an increased understanding and concern by humans for nature? A. importing organisms that could become invasive to try stabilizing existing ecosystems B. getting rid of pollution control laws for industries that promote technology C. removing natural resources at a rate equal to the needs humans D. putting laws in place that regulate the number…

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