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WorksheetsChanges in Ecosystems Test Review
Total questions: 56
Worksheet time: 2hrs 14mins
What is NOT an example of limiting factors?
Predation
Food Source
Space
Migration
Carrying capacity is...
The maximum number of individuals that can fit into an area
Ability of an area to accommodate a growing population
The greatest # of individuals an area can support over time.
The maximum number of species that can co-exist in an area
Which of the following statements is true?
A decrease in food availability lowers carrying capacity.
An increase in water will decrease the carrying capacity.
A fishes population cannot exceed the carrying capacity.
A population stays level once at carrying capacity.
True or False: A natural disaster is an example of a limiting factor.
True
False
Carrying capacity applies to...
Humans
Animals
Plants
All of the above
What is the definition of a population?
All the animals living in an area.
All the people on Earth.
All the members of a species living in the same area.
All living things.
Food, water, sunlight, air, soil are resources that are often __________.
limiting factors
wet
messy
found in rocks
The number of individuals a habitat can sustain with the resources it has available
Carrying capacity
Limiting factors
Resources
Population
If there is more food than usual in an ecosystem, then...
Populations will stay the same
Populations will decrease
Populations will increase
What happens when an environment reaches its carrying capacity?
Populations will decrease
Resources such as food, water, and space will be unlimited
Populations will increase
Nothing, everything will stay the same.
Factors that keep the number of organisms from growing too large
Biotic factors
Abiotic factors
Limiting Factors
Carrying Capacity
What is an invasive species?
an organism that IS native to an area and causes harm to the environment/humans
an organism that is NOT native to an area and causes harm to the environment/humans
an organism that is NOT native to an area and helps the environment/humans
an organism that IS native to an area and helps the environment/humans
Invasive species can have a major impact on the ecosystem.
TRUE
FALSE
Why do the populations of invasive species grow so quickly?
Invasive Species are native to an area.
Invasive species are prey to many animals.
Invasive species have no natural predators.
Invasive species keep the ecosystems in equilibrium.
Invasive species can crowd out native species.
TRUE
FALSE
What is a keystone species?
A species that helps to hold an ecosystem together
A species that lives in or around rocks
Keys and stones have nothing to do with ecology
A keystone isn't a living thing, it's just a stone
A species is defined as endangered when it
suffers from damage to its habitat.
suffers from disease or predation.
when there are hazards to the continued life of the species.
all of the above
Why do endangered species matter?
Because they are cute
Biodiversity
Because if they die we cannot have them as pets
Because they cannot be in the zoo
What is a generalist species?
A species that can adapt to a wide range of habitats
A species that has a narrow range of tolerance and specific habitat and food needs
A species that is highly competitive and invasive
A species that is easily disturbed by invasive species
What advantage do generalist species have in habitats that are constantly changing?
They can easily switch their diet to a new food source
They have a broad range of tolerance
They are less likely to become extinct
They are highly competitive and invasive
What characteristic of generalist species makes them more likely to be invasive?
They have a narrow range of tolerance and specific habitat and food needs
They can adapt to a wide range of habitats
They are highly competitive and invasive
They are easily disturbed by invasive species
What can biodiversity influence within an ecosystem?
how well the ecosystem recovers from a disturbance
how well the ecosystem grows after rain
how poorly the ecosystem responds to a drought
Information on brown tree snakes is provided along with information on the island of Guam. Brown tree snakes were first brought to Guam in 1950. The introduction of tree snakes has brought about changes to the ecosystem on the island of Guam. What is the best evidence of the change?
Several other species of snakes were known to live on Guam before 1950.
The population of lizards on Guam in 1960 was very small.
The longest brown tree snake ever found on Guam measured three meters in length.
Most of the military bases on Guam were closed in the 1980’s.
What is the major difference between primary and secondary succession?
secondary succession involves bare rock
primary succession involves soil to start from
Primary succession starts from bare rock
none of these are correct
Hurricanes, floods forest fires all result in destroyed ecosystems with soil that is intact. What type of succession is this?
primary succession
secondary succession
tertiary succession
quaternary succession
Using the food web what would happen if the eagle became extinct?
The frog population would decrease.
The frog population would increase.
The butterfly population would increase.
The snake population would decrease.
The graph shows that
wolf population control the rabbit population
the rabbit population control the wolf population
the two populations do not affect each other
wolves do not hunt rabbits
If the GRASS became diseased, which organisms would also be NEGATIVELY affected?
Rabbits only
Rabbits and snakes
Rabbits, snakes, and hawks
Rabbits and hawks (snakes benefit)
What happened after 12 months after the hawk population was MOSTLY killed off?
Snakes increased, Rabbits decreased, and Grass increased. Then everything balanced back out to almost normal.
Initially everything was stable, but the snake population killed all the rabbits and then died out themselves.
Everything went down significantly at first, then the hawks recovered.
Everything except the grass died off at first, then the rabbits recovered.
If mice were removed from this ecosystem, which of the
following would also be expected to occur?
a decrease in the cricket population
a decrease in the corn population
a decrease in the hawk population
a decrease in the moth population
Which of the following would cause a decline in the lizard population?
a decrease in the cricket population
an increase in the corn population
a decrease in the mice population
an increase in the moth population
A decrease in which of the following populations would have the greatest effect on the rest of the organisms in this ecosystem?
hawks
corn
crickets
birds
Which of the following could be a long-term result of reducing the herring population in this ecosystem?
an increase in the puffin population
a decrease in the shark population
an increase in the codfish population
a decrease in the humpback whale population
Which of the following would be a result of increasing the krill population in this ecosystem?
a reduction in the humpback whale population
an increase in the jellyfish population
a decrease in the codfish population
an increase in the phytoplankton population
Overhunting of humpback whales would result in which of the following changes to this ecosystem?
a decrease in the puffin population
an increase in the population of krill
an increase in the phytoplankton population
increased competition between top predators
A decrease in the population of sharks due to poaching would cause which of the following factors to immediately increase for the puffins?
Predation
Competition
Parasitism
Adaptation
A reduction in the population of mice in this food web could cause which of the following changes to occur?
a decrease in the grass population
an increase in the snake population
an increase in the grasshopper population
a decrease in the grain population
Insecticides are used by a farmer to decrease the grasshopper population in this area. This reduction in the grasshopper population would also cause which set of changes?
the grain population to decrease and the frog population to decrease
the grain population to decrease and the frog population to increase
the grain population to increase and the frog population to increase
the grain population to increase and the frog population to decrease
Which of these changes would cause an increase in the
cricket population?
a reduction in the mouse population
an increase in the snake population
an decrease in the hawk population
a rise in the lizard population
