Life Boot Camp
5.9C
Predict the effects of changes in ecosystems
caused by living organisms including humans
such as the overpopulation of grazers or the
building of highways.
STAAR 2013 #36; RC 4; Supporting, F
1. The picture below shows a type of plant called kudzu. Kudzu is a fastgrowing Asian vine that was introduced into the United States. Kudzu
quickly uses available resources and can completely cover the plants in an
area. What effect does the rapid growth of kudzu most likely have on an
ecosystem?
F. The variety of native plants decreases.
G. The water supply in the area increases.
H. Weather patterns in the area change.
J. The number of other plants increases
STAAR 2013 #36; RC 4; Supporting
1. The picture below shows a type of plant called kudzu. Kudzu is a fastgrowing Asian vine that was introduced into the United States. Kudzu
quickly uses available resources and can completely cover the plants in an
area. What effect does the rapid growth of kudzu most likely have on an
ecosystem?
F. The variety of native plants decreases.
G. The water supply in the area increases.
H. Weather patterns in the area change.
J. The number of other plants increases
TAKS Study Guide, #13
2. According to the chart, what would most likely happen in
an ecosystem if there were a sudden decrease in the
number of bacteria and fungi?
A
B
C
D
The number of plants would increase.
The number of bees would increase.
The amount of nutrients in the soil would decrease.
The amount of water in the air would decrease.
TAKS Study Guide, #13
2. According to the chart, what would most likely happen in
an ecosystem if there were a sudden decrease in the
number of bacteria and fungi?
A
B
C
D
The number of plants would increase.
The number of bees would increase.
The amount of nutrients in the soil would decrease.
The amount of water in the air would decrease.
2004—#1 (88%)
3. Clearing a forest to build a shopping
mall will most likely result in woodpeckers
—
A
B
C
D
nesting on roofs
losing habitat
laying more eggs
flying slower
2004—#1 (88%)
3. Clearing a forest to build a shopping
mall will most likely result in woodpeckers
—
A
B
C
D
nesting on roofs
losing habitat
laying more eggs
flying slower
2011—STAAR™ Released Test Questions, #10
The picture below shows a frog in a pond containing duckweed.
4. Which of these human activities would most likely cause an overgrowth
of duckweed in a pond environment?
A Gradually introducing geese into the pond
B Fishing in the pond as recreation
C Planting trees in nearby forests
D Heavily fertilizing nearby farm fields
2011—STAAR™ Released Test Questions, #10
The picture below shows a frog in a pond containing duckweed.
4. Which of these human activities would most likely cause an overgrowth
of duckweed in a pond environment?
A Gradually introducing geese into the pond
B Fishing in the pond as recreation
C Planting trees in nearby forests
D Heavily fertilizing nearby farm fields
5. Mountain lions do not live near humans. As the human
population increases, the mountain lion—
A
B
C
D
loses habitat
increases in population
adapts to city life
has more cubs
5. Mountain lions do not live near humans. As the human
population increases, the mountain lion—
A
B
C
D
loses habitat
increases in population
adapts to city life
has more cubs
6. When trees develop leaves in the spring,
changes occur on the forest floor. Why does the
development of leaves cause changes on the
forest floor?
A
B
C
D
Rainfall increases.
Sunlight is reduced.
Wind speed increases.
Animal migration is stopped.
6. When trees develop leaves in the spring,
changes occur on the forest floor. Why does the
development of leaves cause changes on the
forest floor?
A
B
C
D
Rainfall increases.
Sunlight is reduced. (leaves provide shade)
Wind speed increases.
Animal migration is stopped.
7. What is a likely consequence of cutting down
rainforests?
A
B
C
D
A decrease in the amount of air pollution on Earth
An increase in the number of plants living on Earth
A decrease in the variety of organisms living on Earth
An increase in the number of arctic ecosystems on
Earth
7. What is a likely consequence of cutting down
rainforests?
A
B
C
D
A decrease in the amount of air pollution on Earth
An increase in the number of plants living on Earth
A decrease in the variety of organisms living on Earth
An increase in the number of arctic ecosystems on
Earth
8. The diagram below shows an area before and after a housing
development was built there.
Tall pine trees grow very well in East Texas. However, these trees do not do
well in parts of West Texas. Which of the following is MOST important in
determining where a plant can grow and survive?
A
B
C
D
Wind
Climate
Tides
Sunshine
8. The diagram below shows an area before and after a housing
development was built there.
Tall pine trees grow very well in East Texas. However, these trees do not do
well in parts of West Texas. Which of the following is MOST important in
determining where a plant can grow and survive?
A
B
C
D
Wind
Climate
Tides
Sunshine
9. A science teacher bought some tomatoes that were still
green and not yet ripened. He placed half of them in the
refrigerator and half on a kitchen table at room temperature.
After 4 days, the tomatoes in the refrigerator were still
green, while those on the table were red and ripe. Which of
the following is the BEST reason for the difference in
ripening?
A
B
C
D
Tomatoes need sunlight to ripen.
There was not enough air in the refrigerator.
The tomatoes placed in the refrigerator were just bad.
Tomatoes do not ripen well at cold temperatures.
9. A science teacher bought some tomatoes that were still
green and not yet ripened. He placed half of them in the
refrigerator and half on a kitchen table at room temperature.
After 4 days, the tomatoes in the refrigerator were still
green, while those on the table were red and ripe. Which of
the following is the BEST reason for the difference in
ripening?
A
B
C
D
Tomatoes need sunlight to ripen.
There was not enough air in the refrigerator.
The tomatoes placed in the refrigerator were just bad.
Tomatoes do not ripen well at cold temperatures.
10. If a fire destroyed the grasses on a
grassy plain, which animal would most
likely be affected first?
A
B
C
D
Coyotes
Alligators
Rabbits
Red-tail hawks
10. If a fire destroyed the grasses on a
grassy plain, which animal would most
likely be affected first?
A
B
C
D
Coyotes
Alligators
Rabbits
Red-tail hawks
11. Female seals usually return to the same
beaches year after year to give birth. If they
are repeatedly disturbed by humans at those
beaches, how will the seals most likely
respond?
A
B
C
D
They will change color.
They will give birth to more pups.
They will hunt for food more often.
They will give birth at different beaches.
11. Female seals usually return to the same
beaches year after year to give birth. If they
are repeatedly disturbed by humans at those
beaches, how will the seals most likely
respond?
A
B
C
D
They will change color.
They will give birth to more pups.
They will hunt for food more often.
They will give birth at different beaches.
12. Why would fewer bees come to a plant if the petals of
its flowers were removed?
A There would not be any nectar in the flowers.
B The bees would not be attracted to the flowers.
C The bees would not have a spot to land while sipping
nectar.
D The bees would not be able to leave their scent on the
flowers.
12. Why would fewer bees come to a plant if the petals of
its flowers were removed?
A There would not be any nectar in the flowers.
B The bees would not be attracted to the flowers.
C The bees would not have a spot to land while sipping
nectar.
D The bees would not be able to leave their scent on the
flowers.
13. Snakes feed on mice. The mice eat grain
crops. When the crops are plentiful, what will
MOST LIKELY happen?
A
B
C
D
The mouse population will decrease.
The snake population will increase.
The snake population will decrease.
The mouse population will not change.
13. Snakes feed on mice. The mice eat grain
crops. When the crops are plentiful, what will
MOST LIKELY happen?
A
B
C
D
The mouse population will decrease.
The snake population will increase.
The snake population will decrease.
The mouse population will not change.
15. A wetland was drained to build a mall. Two years
later, there were no more toads in that area. Why did
the toads disappear?
A The toads were destroyed by the construction
equipment.
B The toads died because toads cannot breathe out of
water.
C The toads were frightened and went into the woods.
D The toads got their food from the wetland
ecosystem.
15. A wetland was drained to build a mall. Two years
later, there were no more toads in that area. Why did
the toads disappear?
A The toads were destroyed by the construction
equipment.
B The toads died because toads cannot breathe out of
water.
C The toads were frightened and went into the woods.
D The toads got their food from the wetland
ecosystem.
16. Which of these might cause a forest
habitat to become a desert?
A
B
C
D
No rain
Flooded rivers
High winds
Hot summers
16. Which of these might cause a forest
habitat to become a desert?
A
B
C
D
No rain
Flooded rivers
High winds
Hot summers
17. In one study, scientists found that the number of raccoons
increased where people built homes in the raccoons’ habitats.
Which of the following is the MOST LIKELY reason why the
number of raccoons increased?
A
B
C
D
Raccoons no longer lived in wild areas.
Raccoons found more food living near humans.
More predators of raccoons live near people’s homes.
People destroyed raccoon habitats when they built homes.
17. In one study, scientists found that the number of raccoons
increased where people built homes in the raccoons’ habitats.
Which of the following is the MOST LIKELY reason why the
number of raccoons increased?
A
B
C
D
Raccoons no longer lived in wild areas.
Raccoons found more food living near humans.
More predators of raccoons live near people’s homes.
People destroyed raccoon habitats when they built homes.
18. If disease removed a species of plant from a food web,
how would that ecosystem MOST LIKELY be affected?
A All of the plants in the ecosystem would become extinct.
B The organisms that eat the plant would become extinct.
C Consumers of the plant would have a smaller food
source.
D Producers in the ecosystem would have a smaller energy
supply.
18. If disease removed a species of plant from a food web,
how would that ecosystem MOST LIKELY be affected?
A All of the plants in the ecosystem would become extinct.
B The organisms that eat the plant would become extinct.
C Consumers of the plant would have a smaller food
source.
D Producers in the ecosystem would have a smaller energy
supply.
19. A gardener watered each of these pots with equal
amounts of water. Only one pot was given fertilizer that
increases the number of flowers on each plant. Which
plant was PROBABLY given the fertilizer?
A
B
C
D
W
X
Y
Z
19. A gardener watered each of these pots with equal
amounts of water. Only one pot was given fertilizer that
increases the number of flowers on each plant. Which
plant was PROBABLY given the fertilizer?
A
B
C
D
W
X
Y
Z
20. What might happen if the habitat of whitetailed deer decreases in size?
A White-tailed deer will have more food.
B The number of white-tailed deer the habitat
can support will decrease.
C The number of white-tailed deer will increase.
D Weaker white-tailed deer will survive longer.
20. What might happen if the habitat of whitetailed deer decreases in size?
A White-tailed deer will have more food.
B The number of white-tailed deer the habitat
can support will decrease.
C The number of white-tailed deer will increase.
D Weaker white-tailed deer will survive longer.
21. A certain type of wildflower grew in a sunny
meadow. Over several years, nearby trees formed
a shade canopy over the entire meadow. Many
years later, the wildflowers no longer grew in the
meadow. Which factor directly led to the
extinction of this population of wildflowers?
A
B
C
D
The building of large cities
Pollution from nearby homes
Overpopulation of plant-eating organisms
A change in the wildflower’s habitat
21. A certain type of wildflower grew in a sunny
meadow. Over several years, nearby trees formed
a shade canopy over the entire meadow. Many
years later, the wildflowers no longer grew in the
meadow. Which factor directly led to the
extinction of this population of wildflowers?
A
B
C
D
The building of large cities
Pollution from nearby homes
Overpopulation of plant-eating organisms
A change in the wildflower’s habitat
22. Bison are grazing animals. They travel across a
prairie, eating grass. If there were too many bison
in an area, there would probably be—
A
B
C
D
fewer predators of bison
many other large grazing animals
tall shrubs and many trees
less grass and more bare soil
22. Bison are grazing animals. They travel across a
prairie, eating grass. If there were too many bison
in an area, there would probably be—
A
B
C
D
fewer predators of bison
many other large grazing animals
tall shrubs and many trees
less grass and more bare soil
23. A woodland is cut down so a shopping center
and many new houses can be built over the next
two years. What will MOST LIKELY occur in the
local ecosystem in the next five years?
A
B
C
D
Wildlife will compete less for food.
More species of birds will live there.
Water levels will be lower when it rains.
Rain will wash more pollution into creeks.
23. A woodland is cut down so a shopping center
and many new houses can be built over the next
two years. What will MOST LIKELY occur in the
local ecosystem in the next five years?
A
B
C
D
Wildlife will compete less for food.
More species of birds will live there.
Water levels will be lower when it rains.
Rain will wash more pollution into creeks.
24. Highways allow people to travel between towns and
cities. These highways also divide ecosystems into smaller
pieces. Animals can become separated from lakes they use
for breeding. For example, tiger salamanders travel long
distances to breed at certain lakes. How could highway
systems affect animals such as the tiger salamander?
A Tiger salamander habitats may be exposed to less
pollution.
B Tiger salamanders may be cut off from important
resources.
C Tiger salamanders could improve their ability to
remember roads.
D Tiger salamander habitats within ecosystems could
become larger.
24. Highways allow people to travel between towns and
cities. These highways also divide ecosystems into smaller
pieces. Animals can become separated from lakes they use
for breeding. For example, tiger salamanders travel long
distances to breed at certain lakes. How could highway
systems affect animals such as the tiger salamander?
A Tiger salamander habitats may be exposed to less
pollution.
B Tiger salamanders may be cut off from important
resources.
C Tiger salamanders could improve their ability to
remember roads.
D Tiger salamander habitats within ecosystems could
become larger.
25. The Great Barrier Reef has a number of
endangered species which live only in that
ecosystem. What would MOST LIKELY happen if
pollution killed most of the coral that made up the
reef?
A The endangered species might become extinct.
B The animals on the reef would find a new habitat.
C The population size of the endangered species
would increase.
D The endangered species would take the niche of
the dead coral.
25. The Great Barrier Reef has a number of
endangered species which live only in that
ecosystem. What would MOST LIKELY happen if
pollution killed most of the coral that made up the
reef?
A The endangered species might become extinct.
B The animals on the reef would find a new habitat.
C The population size of the endangered species
would increase.
D The endangered species would take the niche of
the dead coral.
26. A species of giant pandas lives only in central
China. Bamboo, a tall, green tropical plant, is the
main food source for these animals. Large areas of
bamboo are being cut down in central China to
make room for growing other crops. What will
MOST LIKELY happen to these giant pandas?
A
B
C
D
They will become endangered or extinct.
They will migrate to warmer areas of China.
They will become carnivores.
They will begin to live in caves.
26. A species of giant pandas lives only in central
China. Bamboo, a tall, green tropical plant, is the
main food source for these animals. Large areas of
bamboo are being cut down in central China to
make room for growing other crops. What will
MOST LIKELY happen to these giant pandas?
A
B
C
D
They will become endangered or extinct.
They will migrate to warmer areas of China.
They will become carnivores.
They will begin to live in caves.
27. The marsh willow herb is a plant that naturally grows in
the northeastern part of the United States. It grows best in
damp habitats. Which of the following environmental
changes would MOST LIKELY cause a decrease in the marsh
willow herb population in an area?
A
B
C
D
A rainstorm lasting several weeks
A drought lasting more than a year
Unusually low temperatures during the month of July
Unusually high temperatures during the month of January
27. The marsh willow herb is a plant that naturally grows in
the northeastern part of the United States. It grows best in
damp habitats. Which of the following environmental
changes would MOST LIKELY cause a decrease in the marsh
willow herb population in an area?
A
B
C
D
A rainstorm lasting several weeks
A drought lasting more than a year
Unusually low temperatures during the month of July
Unusually high temperatures during the month of January
28. Teresa and Rafael each set up a terrarium for a class project.
Teresa never had to add water to her terrarium, but Rafael had to
water his every other day. Why do you think this happened?
A
B
C
D
Teresa poured more water in hers before closing it up.
Rafael used different plants in his terrarium.
Rafael left the top off and the water inside evaporated quickly.
Teresa used more plant food than Rafael did.
28. Teresa and Rafael each set up a terrarium for a class project.
Teresa never had to add water to her terrarium, but Rafael had to
water his every other day. Why do you think this happened?
A
B
C
D
Teresa poured more water in hers before closing it up.
Rafael used different plants in his terrarium.
Rafael left the top off and the water inside evaporated quickly.
Teresa used more plant food than Rafael did.
29. How does too much fishing in an area affect
its ecosystem?
A The fish will lay many more eggs to replace the
fish that were caught.
B Organisms that eat the fish could become
endangered due to starvation.
C Organisms that eat the fish will have to start
eating plants.
D People could eat too many fish and become ill.
29. How does too much fishing in an area affect
its ecosystem?
A The fish will lay many more eggs to replace the
fish that were caught.
B Organisms that eat the fish could become
endangered due to starvation.
C Organisms that eat the fish will have to start
eating plants.
D People could eat too many fish and become ill.
30. Which of the following would have the greatest
effect on an ecosystem because of the changes
made to the environment?
A
B
C
D
Bees building a hive in a hollow tree
Wasps building a nest in a leafy bush
Beavers building a dam across a stream
Fish digging a burrow on a river bottom
30. Which of the following would have the greatest
effect on an ecosystem because of the changes
made to the environment?
A Bees building a hive in a hollow tree
B Wasps building a nest in a leafy bush
C Beavers building a dam across a stream (could slow
down the water too much for other aquatic organisms)
D Fish digging a burrow on a river bottom
31. Which of the following is an example of how
living organisms change their physical
environment to meet their needs?
A Before building their lodge, beavers build a
dam across a stream.
B A bird eats seeds from a backyard bird
feeder.
C A raccoon washes a piece of fruit in a lake
before eating the fruit.
D A young kangaroo climbs into its mother’s
pouch for warmth.
31. Which of the following is an example of how
living organisms change their physical
environment to meet their needs?
A Before building their lodge, beavers build a
dam across a stream.
B A bird eats seeds from a backyard bird
feeder.
C A raccoon washes a piece of fruit in a lake
before eating the fruit.
D A young kangaroo climbs into its mother’s
pouch for warmth.
32. Which of the following is not an example
of a way organisms change their environment
to meet their needs?
A
B
C
D
A wasp builds a nest made of mud.
A human builds a house.
A prairie dog digs a tunnel into the ground.
A bird rests on the limb of a tree.
32. Which of the following is not an example
of a way organisms change their environment
to meet their needs?
A
B
C
D
A wasp builds a nest made of mud.
A human builds a house.
A prairie dog digs a tunnel into the ground.
A bird rests on the limb of a tree.
33. Water lilies growing on ponds and lakes can do
great damage to these bodies of water. How do
the water lilies affect a pond environment in a
dangerous way?
A The fish will not grow and reproduce.
B Water lilies pollute the pond water.
C Water lilies prevent sunlight from reaching
organisms below the water’s surface.
D Water lilies attract many unwanted pests, such
as snakes and turtles to the pond.
33. Water lilies growing on ponds and lakes can do
great damage to these bodies of water. How do
the water lilies affect a pond environment in a
dangerous way?
A The fish will not grow and reproduce.
B Water lilies pollute the pond water.
C Water lilies prevent sunlight from reaching
organisms below the water’s surface.
D Water lilies attract many unwanted pests, such
as snakes and turtles to the pond.
34. Tropical rainforests are cut down and burned at a very
high rate in many parts of the world. An area the size of a
football field is destroyed every second of every day. The
burning wood and vegetation release large amounts of carbon
dioxide. Fewer plants remain to take in carbon dioxide. How
does this burning affect the carbon cycle in tropical rain
forests?
A
B
C
D
More carbon dioxide is released into the atmosphere.
More carbon dioxide is stored in animals.
More carbon dioxide is released into the soil.
More carbon dioxide is stored in plants.
34. Tropical rainforests are cut down and burned at a very
high rate in many parts of the world. An area the size of a
football field is destroyed every second of every day. The
burning wood and vegetation release large amounts of carbon
dioxide. Fewer plants remain to take in carbon dioxide. How
does this burning affect the carbon cycle in tropical rain
forests?
A
B
C
D
More carbon dioxide is released into the atmosphere.
More carbon dioxide is stored in animals.
More carbon dioxide is released into the soil.
More carbon dioxide is stored in plants.
M.S. ?’s
35. All of the following are ways humans can
adversely change the ecosystem EXCEPT—
A. waste dumping
B. using biodegradable products
C. overhunting animals
D. industrial pollution
M.S. ?’s
35. All of the following are ways humans can
adversely change the ecosystem EXCEPT—
A. waste dumping
B. using biodegradable products
C. overhunting animals
D. industrial pollution
36. What effect would building a highway have
on an ecosystem?
A. Increase in butterfly migration
B. Decrease in destruction of habitat
C. Increase in carbon dioxide
D. Increase in oxygen
36. What effect would building a highway have
on an ecosystem?
A. Increase in butterfly migration
B. Decrease in destruction of habitat
C. Increase in carbon dioxide
D. Increase in oxygen
37. Overpopulation animals cause severe damage to an
ecosystem and the surrounding landscape. Additionally,
overpopulation can affect the food chain, water routes, and
land. Based on the information provided, which of the
following is the best conclusion about the effects of
overpopulation?
A. Overpopulation is destroying the entire U.S.
B. Overpopulation does not impact the food chain
C. Overpopulation can change the entire structure of the
ecosystem
D. Overpopulation causes serious issues with the water cycle
37. Overpopulation animals cause severe damage to an
ecosystem and the surrounding landscape. Additionally,
overpopulation can affect the food chain, water routes, and
land. Based on the information provided, which of the
following is the best conclusion about the effects of
overpopulation?
A. Overpopulation is destroying the entire U.S.
B. Overpopulation does not impact the food chain
C. Overpopulation can change the entire structure of the
ecosystem
D. Overpopulation causes serious issues with the water cycle
38. Hunting is an environmental management tool that helps
control wildlife populations. Hunting is an example of—
A. the deer population creating change in an ecosystem
B. the food chain creating change in an ecosystem
C. humans creating change in an ecosystem
D. a cycle creating change in an ecosystem
38. Hunting is an environmental management tool that helps
control wildlife populations. Hunting is an example of—
A. the deer population creating change in an ecosystem
B. the food chain creating change in an ecosystem
C. humans creating change in an ecosystem
D. a cycle creating change in an ecosystem
39. Which of the following is a positive effect of building
highways in an ecosystem?
A. Enhancing access between existing communities
B. Destruction of existing homes and businesses
C. Prohibiting some species from migrating
D. Increase in noise and air pollution
39. Which of the following is a positive effect of building
highways in an ecosystem?
A. Enhancing access between existing communities
B. Destruction of existing homes and businesses
C. Prohibiting some species from migrating
D. Increase in noise and air pollution
40. Which activity by people puts the greatest number of
animals at risk for becoming endangered?
A. starting forest fires
B. destruction of habitat
C. hunting and fishing
D. making pets of wild animals
40. Which activity by people puts the greatest number of
animals at risk for becoming endangered?
A. starting forest fires
B. destruction of habitat
C. hunting and fishing
D. making pets of wild animals
41. What is an effect of cutting down forests for the
development of land and cities?
A. increase in amount of oxygen
B. decrease in energy provided for producers
C. lack of habitat areas for plants and animals
D. gain of habitat areas for new species of animals and plants
41. What is an effect of cutting down forests for the
development of land and cities?
A. increase in amount of oxygen
B. decrease in energy provided for producers
C. lack of habitat areas for plants and animals
D. gain of habitat areas for new species of animals and plants
42. The Texas Blind Salamander lives in the underwater caves
of the Edwards Aquifer, which is used to proved drinking water
for many Texans. The Texas Blind Salamander has been on the
endangered list since 1967. Which could NOT be a possible
cause for the salamanders being on the endangered list?
A. motor oil draining into the sewer
B. using lots of water for irrigation
C. lower average rainfall totals
D. swimming and fishing activities
42. The Texas Blind Salamander lives in the underwater caves
of the Edwards Aquifer, which is used to proved drinking water
for many Texans. The Texas Blind Salamander has been on the
endangered list since 1967. Which could NOT be a possible
cause for the salamanders being on the endangered list?
A. motor oil draining into the sewer
B. using lots of water for irrigation
C. lower average rainfall totals
D. swimming and fishing activities
43. Biologists observe and record the deer population. They
notice that the population is 4 times larger than the habitat can
support. Which is LEAST likely to occur from the
overpopulation of deer?
A. The grass population in the deer’s habitat will begin to
decrease.
B. The deer population will be stronger and healthier.
C. The area’s water source will be reduced or depleted.
D. The deer will spread disease to other animals and humans.
43. Biologists observe and record the deer population. They
notice that the population is 4 times larger than the habitat can
support. Which is LEAST likely to occur from the
overpopulation of deer?
A. The grass population in the deer’s habitat will begin to
decrease.
B. The deer population will be stronger and healthier.
C. The area’s water source will be reduced or depleted.
D. The deer will spread disease to other animals and humans.
44. Based on the information given in the table, why do
overpopulated animals wander?
Effects of Overpopulation of Grazers
1. Wander into areas populated by humans.
2. Wander onto roads and highways and get killed.
3. Rummage through garbage and kill farm animas.
A. Their natural ecosystem can no longer support them.
B. They migrate to compete with other species for garbage.
C. Their natural ecosystem has a vast supply of food and water.
D. They migrate to areas where there are fewer producers.
44. Based on the information given in the table, why do
overpopulated animals wander?
Effects of Overpopulation of Grazers
1. Wander into areas populated by humans.
2. Wander onto roads and highways and get killed.
3. Rummage through garbage and kill farm animas.
A. Their natural ecosystem can no longer support them.
B. They migrate to compete with other species for garbage.
C. Their natural ecosystem has a vast supply of food and water.
D. They migrate to areas where there are fewer producers.
45. Student are given an assignment to research and document
the negative and positive effects of changes in ecosystems
caused by humans. Which of the following tools would be
most appropriate to use for this assignment?
A. notebook
B. calculator
C. hand lens
D. aquarium
45. Student are given an assignment to research and document
the negative and positive effects of changes in ecosystems
caused by humans. Which of the following tools would be
most appropriate to use for this assignment?
A. notebook
B. calculator
C. hand lens
D. aquarium
46. A group of students is exploring the causes of change in the
physical structure of a forest ecosystem. Each student in the
group makes a prediction of how changes will impact the
ecosystem. The students have each—
A. made a table
B. formed a hypothesis
C. developed a model
D. planned an experiment
46. A group of students is exploring the causes of change in the
physical structure of a forest ecosystem. Each student in the
group makes a prediction of how changes will impact the
ecosystem. The students have each—
A. made a table
B. formed a hypothesis
C. developed a model
D. planned an experiment
47. In order to reduce the negative impact on the ecosystem, it
is important that people —
A. make informed choices in conservation
B. demonstrate safety practices
C. record data using technology
D. neglect wildlife regulations
47. In order to reduce the negative impact on the ecosystem, it
is important that people —
A. make informed choices in conservation
B. demonstrate safety practices
C. record data using technology
D. neglect wildlife regulations
48. In class, students learned that conserving water reduces the
human impact on area watershed. Students want to
investigate whether 4th or 5th graders use the most water when
washing their hands. Which part of the investigation should be
recorded?
A. height of the students
B. time the faucet is turned on
C. size of the sink
D. grade level of the students
48. In class, students learned that conserving water reduces the
human impact on area watershed. Students want to
investigate whether 4th or 5th graders use the most water when
washing their hands. Which part of the investigation should be
recorded?
A. height of the students
B. time the faucet is turned on
C. size of the sink
D. grade level of the students
49. Students are doing outdoor experiment in a marshy area.
They are collecting water samples for viewing under the
microscope to determine if pollution has impacted the health
of the pond. The water is oily and shiny, and students are not
sure what is in the water. All are good precautions to use while
gathering the water samples EXCEPT—
A. wearing rubber gloves
B. running around the pond
C. keeping long hair tied back
D. staying with the group
49. Students are doing outdoor experiment in a marshy area.
They are collecting water samples for viewing under the
microscope to determine if pollution has impacted the health
of the pond. The water is oily and shiny, and students are not
sure what is in the water. All are good precautions to use while
gathering the water samples EXCEPT—
A. wearing rubber gloves
B. running around the pond
C. keeping long hair tied back
D. staying with the group