Exam 45: The Global Ecosystem

A mountainous region undergoes a long period of windy,rainy weather,which increases the rate of weathering of the area's limestone rock.This releases calcium and carbonate ions,causing a flux of these ions from an _______ form to an _______ form.

Agricultural soil in a relatively dry region of the United States has been tilled for many years and has undergone both erosion and irrigation.An inadequacy of which factor is most likely to limit plant productivity in this soil?

Primary productivity is likely to decrease in very wet environments,where soils are water-saturated,because plants receive

Rice cultivation contributes to greenhouse warming through increases in concentration of the greenhouse gas _______.

Refer to the graphs below.Given the information in the two graphs,explain how the ant colony obtains nitrogen.Provide evidence for your answer.

According to the diagram below,humans are responsible for approximately _______ percent of the total amount of global nitrogen fixation on land.

Explain how rising global temperatures alter the global water cycle.

An international group formed in 1988 to collect and collaborate on scientific data regarding climate change has provided several updated reports since its beginning.This group is known as the _______.

After microorganisms break down dead organic matter,the resulting materials are taken up in ionic form by plant roots.This represents biological uptake that converts materials from an _______ form to an _______ form.

One prediction about global warming is that it is likely to increase the intensity of storms.What factors might bring this about?

The process in the water cycle that moves the most water during a given time is

How do humans compare with other species in their ability to cooperate with other members of their species?

A bacterium living in nodules on the roots of legumes is able to convert nitrogen gas from the atmosphere into a soluble form that can be taken up and used by the legume. This soluble form is most likely

How likely is it that organisms will respond to rapid climate change by undergoing short-term evolutionary adaptations?

The two largest reservoirs of carbon on Earth are

The mountains of western North America are warming rapidly,leading to more rapid death of whitebark pines in this alpine ecosystem.The mountain pine bark beetle,which once lived at lower elevations,has invaded the warming alpine ecosystem and now attacks and destroys whitebark pines.How are these responses to global warming likely to affect alpine ecosystems?

Which organism response most likely represents a change in timing based on environmental cues related to climate change?

CO₂ concentrations in the Northern Hemisphere follow which pattern of seasonality?

Design an experiment to determine if NPP in a grassland region is limited by the amount of precipitation the plants receive.

Which process drives the cycling of water through the world system?