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Example Questions
Example Question #15 : Understanding Eco Chemical Cycles
Which of the following are levels of the carbon cycle?
Geosphere
All of these
Atmospheric biosphere
Terrestrial biosphere
All of these
The carbon cycle includes three levels: the geosphere, the terrestrial biosphere, and the atmospheric biosphere. The geosphere refers to the solid part of the earth, the terrestrial biosphere refers to all the living organisms on the land, and the atmospheric biosphere refers to the living organisms in space between the land and the outer ends of the atmosphere. Carbon is present in all levels and travels throughout the levels through various processes including photosynthesis, dissolution, and decay.
Example Question #1772 : Ap Biology
Which of the following best explains where nitrogen can be found in the terrestrial biosphere?
Decomposing matter
Humus
All of these
Living organisms
All of these
Nitrogen is necessary for all life; therefore, it is present in the territorial biosphere in living organisms, humus, and decomposing matter.
Example Question #16 : Understanding Eco Chemical Cycles
Which of the following best describes the process of nitrogen fixation?
Bacteria fixes atmospheric nitrogen into ammonia
Nitrates are converted into nitrogen gas by bacteria
Organic nitrogen is converted into ammonia by bacteria
Plants absorb nitrogen from the soil
Bacteria fixes atmospheric nitrogen into ammonia
Nitrogen fixation can be described as the process in the nitrogen cycle in which bacteria “fix” atmospheric nitrogen into ammonia and usable forms of organic nitrogen.
Example Question #17 : Understanding Eco Chemical Cycles
Which of the following is not true regarding the assimilation stage of the nitrogen cycle?
Plants absorb nitrogen from the soil
Nitrogen is incorporated into plants through roots as nitrate ions, nitrite ions, and ammonium ions
Atmospheric nitrogen is converted into organic nitrogen
Symbiotic bacteria may aid with absorption of nitrogen from the soil
Atmospheric nitrogen is converted into organic nitrogen
In the process of assimilation, organic nitrogen is incorporated into plants through the roots. The type of nitrogen incorporated may be nitrate ions, nitrite ions, or ammonium ions. Symbiotic bacteria may assist this process.
Example Question #1775 : Ap Biology
Bacteria convert dead organic tissue into which of the following forms of nitrogen?
Nitrate
Nitrogen gas
Nitrite
Ammonium
Ammonium
During ammonification, saprobiotic bacteria convert dead organic nitrogen in the soil into ammonium.
Example Question #1776 : Ap Biology
Which of the following types of soil bacteria convert ammonia into nitrate molecules during nitrification?
Nitrifying bacteria
None of these
Denitrifying bacteria
Saprobiotic bacteria
Nitrifying bacteria
Nitrification takes place in the soil and is the process in which ammonium is converted into nitrate. Nitrifying bacteria facilitate this process.
Example Question #21 : Understanding Eco Chemical Cycles
Which of the following sets of two nitrogen cycle processes involve atmospheric nitrogen?
Ammonification and nitrogen fixation
Ammonification and nitrification
Nitrification and denitrification
Denitrification and nitrogen fixation
Denitrification and nitrogen fixation
The processes of denitrification and nitrogen fixation both involve atmospheric nitrogen. Nitrogen fixation is the conversion of atmospheric nitrogen into ammonia and organic nitrogen by nitrogen fixing bacteria. In denitrification, denitrifying bacteria convert nitrates into nitrogen gas, which is released into the atmosphere.
Example Question #22 : Understanding Eco Chemical Cycles
In the process of denitrification, which of the following forms of nitrogen is returned to the atmosphere?
Nitrate
Nitrite
Ammonium
Nitrogen gas
Nitrogen gas
Denitrification is the final process of the nitrogen cycle in which soil-dwelling denitrifying bacteria convert nitrates back into nitrogen gas. The nitrogen gas is released back into the atmosphere.
Example Question #1779 : Ap Biology
Which of the following is an alternative source of natural nitrogen in ecosystems?
Lakes
None of these
Shells
Bedrock
Bedrock
An alternative source of naturally occurring nitrogen in ecosystems is bedrock. Bedrock is nitrogen rich and can be broken down to act as a nitrogen source.
Example Question #23 : Understanding Eco Chemical Cycles
Which of the following best explains how atmospheric nitrogen enters the nitrogen cycle in marine ecosystems?
Through precipitation
Through animal excretions
Through plant decomposition
Through algae waste
Through precipitation
The marine nitrogen cycle is very similar to the terrestrial nitrogen cycle. In marine ecosystems, atmospheric nitrogen enters the cycle through precipitation.
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