APES Midterm

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The concentration of H+ ions in a solution with a pH value of 4 is how many times as great as the concentration of H+ ions in a solution with a pH value of 7?

1000

The pH at which 50% of the daphnia survive after 2 hours of exposure can be predicted from the data. This pH is closest to

4.5

On the basis of the data, the best prediction of the pH of the water in which daphnia normally are found in the wild

7

Represents the biotic potential of the species

A

This pattern of change in vegetation is primarily the result of

And increase in both the mean annual temperature and mean annual precipitation

Plant roots absorb ammonia ions and nitrate ions for use in making molecules such as DNA amino acids and proteins

Assimilation

Country with the greatest percentage of land area affected by desertification

Australia

A field is abandoned in an invasive plant that can be a nutrient poor soil moved 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 be best made

Bacteria in soil and in route nodules converted free nitrogen into nitrogen compounds

Represents the growth of a population predicted by the logistic model

C

How does the burning of fossil feels 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

The rapid rate of this process and tropical forest results in low nutrient soils

Decomposition

Nitrate ions and nitrite ions are converted into nitrous oxide gas and nitrogen gas

Denitrification

The process by which a soil nutrients is reduced and release to the atmosphere as a gas

Denitrification

Which of the following best illustrates the concept of the tragedy of the commons

Depletion of an aquifer by regional farmers

Which of the following is the best illustration of a tragedy of the commons?

Depletion of fishing stocks in the North Atlantic

Represents the maximum number of individuals that can be supported by a particular ecosystem on a long-term basis

E

In Mediterranean climate regions like portions of California a wetter than normal winter often leads to greater severity of fires the following summer this seeming paradox occurs because increased rains leads to

Greater accumulation of Chaparral biomass

The factor that likely possesses the great threat of extinction worldwide is

Increasing loss of habitat

How would including the control group be useful in this experiment

It would provide a reference for the affects of random environmental factors

Ammonia is converted to nitrite, then to nitrate

Nitrification

The arrow represents an approximate pH of which of the following

Normal rainfall

Photosynthesis is the major source of which of the following gases in earths atmosphere

O2

The process in which glucose is synthesized by plants

Photosynthesis

Of the following which is the best example of reclamation of disturbed lands

Restoring vegetation to an area that has been mined

Country with the largest area of boreal forest

Russia

Which of the following is the best example of a keystone species

See Otter

If the pond is resampled A year later which of the following would best indicate that the pond has been adversely affected by adjacent development?

The biodiversity of the pond has decreased

Population biologist are concerned about introduced species such as the zebra muscle in North America because

The introduced species compete for resources more effectively than native species

Which of the following can be estimated from the sample for the invertbrates in the pond?

The species richness

Which of the following is true of farm raised salmon?

They are often infected with parasites and sea lice

Why do introduced species often become pests

They displace native species

Country with the largest area of temperate deciduous forest

USA

Which of the following best helps to explain why phosphorus is often a limiting factor in many ecosystems

Under many conditions phosphorus form stable insoluble compounds


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