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Answer : the greatest threat to the world's grasslands is :
b) agriculture
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- A limiting resource does all the following except that it (a) tends to restrict the ecological niche of a species (b) is in short supply relative to a species need for it (c) limits the presence of a species in a given community (d) results in an intermediate disturbance (e) may be limiting for only part of an organisms life cycleWhich of the following statements about the effects of clear-cutting on the Amazonian forest are true? Select all that apply. a) Soil moisture is likely to decline. b) Nutrient export is likely to decline. c) Species diversity is likely to decline. d) Atmospheric CO2 is likely to decline.Approximately how much rain forest is being lost per year? a. 70,000 hectares b. 700,000 hectares c. 7,000 hectares d. 7,000,000 hectares
- Through succession, a field becomes a forest as hardwood trees become the dominant species in the ecosystem. Grasses are no longer able to compete as well in the forested environment. grasses → shrubs → softwood trees → hardwood trees Which is most likely the limiting factor that inhibits the growth of the grasses in the forest? a slow rates of decomposition on the forest floor b low levels of sunlight reaching the forest floor c thin layers of topsoil on the forest floor d low levels of humidity near the forest floorA good way to define wilderness is to refer to it as___ A.a landscape not impacted by humans B.a landscape so diverse as to be nearly impenetrable C.an ecosystem in need of development D.an ecosystem in a state of dysfunctionWhich of the following could qualify as a top-down control ona grassland community?(A) limitation of plant biomass by rainfall amount(B) influence of temperature on competition among plants(C) influence of soil nutrients on the abundance of grassesversus wildflowers(D) effect of grazing intensity by bison on plant speciesdiversity
- The concept of "forest disturbance" refers to a. The emotional state of forests when they are being bothered by something b. events such as forest fire, harvesting, wind-throw, insect and disease outbreak.* c. Events that reduce the amount of CO2 released into the atmosphere. d.None of the above asapWhich of the following is one of the biggest threats to biodiversity? A. Invasive species B. Land protection C. Ecological conservation D. Habitat restorationWhich of the following relationships explains the high diversity of species in tropical forests? Group of answer choices a. burning forests return CO2 to the atmosphere b. populations grow rapidly when N is small c. tropical forests occur near the equator d. high energy input allows for a large number of trophic levels e. keystone species control species diversity
- A keystone species is one whose removal from a community causes extinction of other species. How does this extinction happen?Choose a biological resource and address the following four questions using examples with that biological resource. a) Biomass production over time b) Carrying capacity and extinction threshold c) Management of the recruitment rate d) Describe two ways that climate change could impact the biological resource you selected for this question RESOURCE ECONOMICSIn a temperate grassland system area of North America, vegetation has been destroyed by fire. What will happen to the net primary productivity and the local ecosystem when rains return in the next season? a The grasses will grow back, but the herbivores that lived there will not return, as they would have found new land to live on. Therefore, the net primary productivity would decrease. b The grasses will not grow back, therefore the herbivores that lived there will not return. Thus, the net primary productivity would decrease. c The grasses will grow back and the herbivores that lived there will return. The net primary productivity should also be similar to the previous season. d The grasses will grow back and the herbivores that lived there will return. The net primary productivity would be less than the previous season.
