Unit 1 apes

The largest area of old-growth forest in the United States is located in

Alaska

A field is abandoned, and an invasive plant that can live in npoor soil moves into the field. If the land is later cleared of this invasive species and it is discovered that the soil has an abundance of nitrogen compounds, what conclusion can best be made?

Bacteria in soil and in root nodules converted free nitrogen into nitrogen compounds.

How does the burning of fossil fuels contribute to the net increase in atmospheric carbon?

Carbon that has been sequestered underground is added to the carbon cycling between the atmosphere and the biosphere.

Which process in the nitrogen cycle releases nitrogen gas into the atmosphere?

Denitrification of soil nitrates by bacteria

Which of the following is an example of a carbon sink?

Deposition of organic matter on the deep ocean floor

Which environment is most likely to be characterized by dry scrub with frequent fires?

Graph C

Assuming all other variables are constant, which of the following is the most likely conclusion about the great potential for gross primary productivity that can be supported by data in the graph?

Gross primary productivity in Location 1 is greater than that in Location 2 in March

The shaded regions in the diagram below show where different species of warblers, a type of bird, hunt for insect in the same tree. Which of the following interactions between the warbler species is shown in the diagram?

Resource partitioning

Which of the following biogeochemical cycles is correctly paired with its largest reservoir?

The nitrogen cycle and the atmosphere

This biome has the highest net primary productivity, in part because of consistently warm temperatures and abundant sunlight.

Tropical rainforest

The underlying subsoil of this biome is permafrost, which prevents both water draining through and deep-rooted plants from growing. Additionally, there is very little precipitation per year.

Tundra

Which of the following processes shown in the diagram leads to precipitation?

evaporation rate

For a primary producer, the main function of photosynthesis is to manufacture

glucose

Phytoplankton are most abundant in the upper few hundred feet of most bodies of water because

sunlight does not penetrate to great depths in water

Based on the table, which of the following claims about the relationship between the tree finch and the invasive fly is best supported?

the flies and finches have a parasitic relationship

The net primary production of a pine forest on a lava flow on Mount Fuji is about 175,000 kcal/m / yr, and the plant respiration is estimated to be 115,000 kcal/m / yr. What is the total amount of energy transferred during photosynthesis for this ecosystem?

290,000 kcal/m / yF (175+115)

The atmospheric concentration of carbon dioxide increased from 278 ppm in 1790 to 383 ppm in 2007. What is the approximate percent increase in carbon dioxide concentration from 1790 to 2007?

38%