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ENV 101 - Exam 2
Chapter 4, 5, 6 Environmental Science
49
Environmental Studies
Undergraduate 3
09/29/2012

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Term
You are in an area that is relatively hot. You bend down and notice that there are tracks in the soil that are very old. Since you know that this area is easily destroyed by human activity and the harsh climate slows recovery from human damage you conclude that this biome is
Definition
A desert
Term
Morpheus, Trinity and Neo are on the wet western coast of North America and as they look around they see lots of mosses, lichens and ferns covering the tree branches. Condensation from fog on the leaves is a major form of precipitation. Where are they?
Definition
Temperate rainforest
Term
Deciduous forests
Definition
Have trees that shed their leaves seasonally
Term
Many people in the United States take trips in the spring to see annual flowers that grow and flower before they are shaded by canopy. Where are these people going?
Definition
Temperate deciduous forest
Term
Boreal forests are generally
Definition
Slow-growing because of the cold temperatures
Term
Morpheus has been led into a wilderness environment and left to fend for himself for the summer. Luckily, he has a good coat because it looks like there may be a frost during the night and the mosquitoes are everywhere. As he looks around, he is relieved because he recognizes some of the plants. There are some mosses, lichens, small shrubs, sedges and grasses. Which biome is he in?
Definition
Temperate rainforest
Term
The biome type that has a short growing season and is summer feeding and breeding grounds for caribou and musk-ox is the
Definition
arctic tundra
Term
Mangrove trees are found along ________________ shorelines
Definition
tropical saltwater
Term
Which of the following protects mainland shores form the force of waves?
Definition
barrier islands
Term
Freshwater ecosystems
Definition
include lakes, marshes, bogs and fens
Term
Oxygen levels are lowest in what section in the diagram?
Definition
e
Term
What aquatic ecosystem phenomenon is illustrated in the diagram?
Definition
vertical stratification
Term
The thermocline is the layer in a lake at which
Definition
the warm upper zone meets the cold lower zone
Term
Wetlands are biomes that
Definition
are wet at least some of the year
Term
The biome type that has lost the greatest percentage of its original area due to human activities is the
Definition
temperate deciduous forest
Term
Estuaries are noted by biologists because they have few, but highly specialized, biological niches.
Definition
true
Term
Wetlands perform a major ecosystem service of trapping and filtering water as it passes through the wetland
area.
Definition
true
Term
Arctic deserts and tundra are the least disturbed by humans since they are usually unattractive places for humans to live.
Definition
false
Term
An organism's biotic potential is the maximum number of offspring
Definition
it actually produces over its lifetime
Term
In the real world, many factors determine the numbers of organisms in any one population. Yet, a "superfly" with unlimited food and no mortality would show what type of growth?
Definition
exponential growth
Term
In cases of exponential growth rates, a population ________ each year.
Definition
increases at the same rate
Term
Which of the following sequences is an example of exponential growth rate?
Definition
all of these sequences are examples of geometric growth rate
Term
A population growing at 1 percent per year should double in about ___ years.
Definition
70
Term
The doubling time for a population with an annual growth rate of 0.07 is
Definition
50 years
Term
Carrying capacity is the population
Definition
of a species that an environment can support on a long-term basis
Term
In the real world, population explosion is usually followed by
Definition
a gradual decrease in population as food supplies dwindle
Term
A dieback or population crash, often occurs after a species ________ its environmental carrying capacity.
Definition
overshoots
Term
An island has formed off the coast of the Pacific Northwest. The Department of Natural Resources (DNR) has determined that there is enough land area for a herd of 100 elk, yet they say the carrying capacity is only 60 elk. This inequality can best be explained by the fact that the
Definition
Physical factor of space is only one of the determiners for population size in a community
Term
Logistic growth rates are those in which a population
Definition
Grows rapidly when conditions are good, then slows as it approaches carrying capacity
Term
The ability to produce rapid population overshoots can be a useful strategy for a species that tends
Definition
colonize new territory
Term
Which of the following types of population curves would best represent a group of elephants that enter a new, open habitat and become a stable part of that ecosystem?
Definition
s-shaped curve
Term
You are studying an organism that is a pioneer species is an opportunist and does not care for its offspring. This organism probably has a _________________ population growth strategy.
Definition
r-adapted
Term
You are studying an organism that is fairly large, matures slowly, lives fairly long and cares for its offspring. This organism probably has a _________________ population growth strategy.
Definition
k-adapted
Term
An organism with ___________ "strategies" would be considered to have __________ natality.
Definition
r-adapted;high and k-adapted;low
Term
Natality is usually
Definition
variable, depending on environmental conditions
Term
The term "fecundity" refers to an organism's ____________ while fertility is ______________.
Definition
physical ability to reproduce; actual number of offspring produced
Term
Life expectancy is the
Definition
number of years an individual of a certain age will probably live
Term
Survivorship is determined by
Definition
percentage of a cohort that survives to a certain age
Term
The longest period of life that a given type of organism can reach is known as
Definition
life span
Term
If there is no migration, the size of a population is limited solely by interaction between
Definition
natality and mortality
Term
Predation is considered to be a(n) _______________ factor.
Definition
extrinsic and biotic
Term
Which of the following is an abiotic population control mechanism?
Definition
water shortages (?)
Term
Which of the following is a biotic population control mechanism?
Definition
pathogens
Term
In general, abiotic regulatory factors tend to be ___________ while biotic factors tend to be _____________.
Definition
density-independent; density-dependent
Term
Which of the following is an intraspecific interaction?
Definition
territoriality
Term
How does island biogeography apply to ecosystems other than islands?
Definition
habitat fragmentation has formed islands of habitat in "oceans" of development
Term
Genetic diversity is lost in a small population when
Definition
only a few individuals survive a catstrophe
Term
White-tailed deer populations are at about the same levels as they were a century ago.
Definition
false
Term
What environmental factor does not change between "b" and "e" in the diagram?
Definition
All of these change between "b" and "e."
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