APES Midterm
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