APES Ch. 5 Practice Quiz
Which of the following statements about dead zones is correct?
Dead zones are reversible if nutrient pollution input to a system is reduced.
Nitrogen availability is often a limiting factor in plant growth. Nitrogen tends to be scarce because __________.
Nitrogen gas (N2) is so stable that only a few organisms are capable of turning it into nitrogen that can be used for living things.
_____ is an example of a resource provided by our ecosystems, while _____ is(are) an example of a service provided by our ecosystems.
Water, water cycling
A metapopulation is ______________.
a network of separate populations with some interbreeding between them
A(n) _____ is an example of an ecosystem with high primary productivity while a _____ is an example of an ecosystem with low primary productivity.
algal bed, desert
Some of the most ancient water on Earth can be found in ________.
aquifers
Positive feedback loops _______.
are more common in natural systems altered by human actions
Ecosystems that convert solar energy to biomass rapidly ________.
are said to have high primary productivity
What does the term emergent properties describe?
characteristics that are not evident in the system's individual components but are evident only by looking at the whole operating system
Which best describes how energy and nutrients work in an ecosystem?
energy flows through an ecosystem; nutrients cycle
Which of the following best characterizes the factors that have contributed to the "dead zone" in the waters of the Chesapeake Bay for the past few decades?
fertilizer runoff from farms, animal manure, and stormwater runoff
Which of the following would be considered an emergent property of a tree?
its role as a habitat for other organisms in the ecosystem
The structural sphere of Earth that is best described as the rocks and sediment is the ______.
lithosphere
A contributing factor in the process of eutrophication is ______.
nitrogen and phosphate pollution
The process that makes nitrogen available to plants by mutualistic and free-living bacteria is called __________.
nitrogen fixation
All of the following are considered reservoirs of carbon except ______.
phosphorus sediments
In the carbon cycle, carbon moves from the atmosphere into the living portion of the cycle through ______.
photosynthesis
Which of the following would destabilize an ecosystem?
positive feedback loops
When considering the phosphorus cycle, plants obtain most of their phosphorus from _______.
rocks and soils
Net primary production in an ecosystem can be calculated by ______.
subtracting respiration from gross primary production
Which of the following processes was responsible for humans increasing nitrogen's flux from the atmosphere to Earth's surface?
the Haber-Bosch process
The sum total of the planet's living organisms and abiotic systems is ________.
the biosphere
A landscape ecologist would be most likely to study ______.
the movement of nutrients from alpine grassland on a mountain through the temperate deciduous forest at the lower elevations into the tropical rain forest at the base
The largest reservoir of carbon in the carbon cycle is in sedimentary rock that may take hundreds of millions of years to return to the living portion of the cycle. What is the second largest reservoir of carbon?
the oceans
How do plants contribute to the water cycle?
through the process of transpiration