Exam 22: Biogeochemical Cycles

Which of the following elements is a limiting reagent in forming rubisco?

Which of the following cycles is thought to be most under biological control?

The ability of the surface waters of the ocean to take up carbon dioxide is governed by the reaction of carbon dioxide with the ________ ion to form bicarbonates.

Seasonal fluctuations in atmospheric carbon dioxide concentrations are greater in the Northern Hemisphere than in the Southern Hemisphere.

Soil formation and soil characteristics have major influence on the processes of nutrient retention and release.

Which group is responsible for converting H2S into sulfates?

A primary measure of productivity is linked to

Plant roots compete with Nitrosomonas and Nitrobacter for ammonium in soil.When these bacterial groups acquire the ammonium,they turn it into

Which of the following cycles have particles deposit from the atmosphere in both a dryfall and a wetfall?

The main reservoirs of oxygen are water and ________.

The two basic types of biogeochemical cycles are gaseous and ________.

Precipitation can be a significant input of nutrients in ecosystems.

Fossil fuels develop as a result of complete decomposition of organic matter in swamps and marshes.

Phosphorus is typically in short supply in aquatic and terrestrial ecosystems.

Global estimates of denitrification in terrestrial ecosystems vary widely but are of the order 200 × 1012 g/yr,and more than half of that total occurs in wetland ecosystems.If restoration results in an increase in wetland area by approximately 25 percent,it would be expected that losses of nitrogen through denitrification would be closer to

Biological nitrogen fixation is accomplished by

The waste product of microbial decomposition is converted to what in acidic soils?

Which region contains the largest amount of the global phosphorus pool?

Undecomposed organic matter in the form of fossil fuels and carbon in sedimentary rocks represents a net positive flux of oxygen to the atmosphere.

The phosphorus cycle is a sedimentary cycle with essentially no gaseous cycle.