Ecology Test 1 Chapter 27 Flashcards
What are biogeochemical cycles?
biological, geological, and chemical transport mechanisms
What is the biochemical oxygen demand?
a measure of eutrophication which is the difference between the production of oxygen by plants and the amount of oxygen needed for respiration for the organisms in the water
What are aquifers?
underground water supplies
The concentration of certain chemicals such as DDT, in higher trophic levels is known as?
Biomagnification
Which of the following nutrients does not cycle globally?
Phosphorus
Eutrophication is highest where biological oxygen demand is?
High
Primary producers acquire the carbon necessary for photosynthesis from?
Carbon dioxide in the atmosphere
In the immediate future, atmospheric carbon dioxide levels are likely to?
Increase
Nitrogen fixation is the process ?
By which atmospheric nitrogen is converted to ammonia or ammonium ions
Which is the correct order of processes in the nitrogen cycle?
Nitrogen fixation, nitrification, assimilation, ammonification denitrification
What organisms are important nitrogen fixers in aquatic ecosystems?
Cyanobacteria
More rainfall occurs over land than at sea?
False
Eutrophication is?
Caused by an overabundance of nutrients, which leads to an increase in algal populations
