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Worksheets5.9C STAAR Changes to Ecosystems Review
Total questions: 21
Worksheet time: 1hrs 27mins
Name
Class
Date
1.
too many of the same organism in one area
a)
native species
b)
overpopulation
c)
invasive species
d)
restore (restoration)
2.
type of organisms that normally live in a particular ecosystem
a)
overpopulation
b)
invasive species
c)
native species
d)
impact
3.
organisms that entered a new ecosystem and multiplied, hurting native species and their habitats
a)
overpopulation
b)
inpact
c)
restore (restoration)
d)
Invasive species
4.
problem that occurs when grazing animals like cattle and sheep eat too much vegetation (grass)
a)
habitat
b)
overgraze
c)
thrive
d)
global warming
5.
Natural disasters can also change ecosystems. What can organisms do if a disaster happens?
a)
Fight, Survive, Struggle
b)
Move, Adapt, Die
c)
Stay, Sleep, Survive
d)
Eat, Sleep, Repeat
6.
How does a bird "change its environment" to meet its NEEDS?
a)
builds a nest
b)
flies around
c)
catches bugs
d)
looks for something to eat
7.
6. A squirrel makes a change to its environment when it —
a)
climbs a tree
b)
digs a hole to bury an acorn
c)
collects acorns
d)
jumps from tree to tree
8.
Which of the following would have a negative impact on an ecosystem
a)
constructing highways
b)
planting trees
c)
recycling paper
9.
How would building a highway affect an ecosystem?
a)
saltwater pollutes fresh water
b)
marine life is threatened
c)
it would not change the ecosystem
d)
animals cannot travel through their ecosystem the same
10.
What would cause a decrease in the rabbit population?
a)
An increase in grass growing
b)
A decrease in caterpillars
c)
An increase in owls
d)
An increase in fox
11.
Which of these populations is most likely to decrease if the number of grasshoppers decreases?
a)
plants
b)
frog
c)
praying mantis
d)
owl
12.
An example of a natural change to the ecosystem is:
a)
A highway built in the middle of the desert.
b)
Lightening strikes and starts a fire in the forest.
c)
A rancher placing too many grazers in a small area leading to overgrazing.
13.
A foreign insect is introduced into the Texas. It eats a lot of leaves, and trees start to become leafless. Many different animals feed on the new insect, but even they cannot control its numbers. Eventually, trees begin to die. Why would a rapid increase of the new insect population cause certain species of herbivores to vanish or be fewer in number?
a)
They would not have enough to
eat.
b)
They
would not have enough space to live.
c)
They
would not have tree bark to eat.
14.
A manatee is a water-dwelling herbivore on the list of endangered species. If manatees were to become extinct, what would be the most likely result in areas where they had lived?
a)
Certain producer organisms would become more
abundant in the area.
b)
Other
manatees would move into the area and restore balance.
c)
Predators in the area would have more
food to eat.
d)
The
area would not be affected.
15.
How would beavers building a dam cause an increase in the fish population? The dam
a)
blocks a river and creates a lake.
b)
causes
predators to hunt more fish.
c)
forces
many birds to leave the ecosystem.
d)
removes
trees from around the river.
16.
Scientists are concerned about overfishing of shark populations. Sharks feed on rays and rays feed on scallops. Without sharks, rays consume all the scallop beds. This situation demonstrates that:
a)
humans can improve an ecosystem by
removing predators.
b)
humans
can upset an ecosystem by removing species.
c)
reducing
the shark population increases the quantity of scallops that can be taken.
d)
sharks
are not important for the stability of the ecosystem.
17.
Highways allow people to travel between towns and cities, but it also divides ecosystems into smaller pieces. Animals can become separated from lakes they use for food and shelter. For example, tiger salamanders use lakes for these reasons. How could the building of highways affect animals such as the tiger salamander?
a)
Tiger salamanders could improve lake
ecosystems.
b)
Tiger
salamanders may be cut off from important resources.
c)
Tiger salamander habitats may have
less pollution.
d)
Tiger salamander habitats within
ecosystems would become larger.
18.
A park is home to a large number of robins, squirrels and rabbits. The robins and squirrels live in the park’s trees. The robins feed on earthworms and insects that live on the ground. The squirrels eat the acorns produced by the park’s oak trees. The rabbits hide in the bushes and feed on the grass. Which factor would negatively impact the number of rabbits living in the park?
a)
Collecting acorns off the ground.
b)
Planting more trees.
c)
Removing park bushes.
d)
Removing the squirrels.
19.
If humans cleared a forest to build homes, we would expect _____________.
a)
fewer
tree-dwelling animals
b)
increased insect populations
c)
more development of soil
d)
more
frequent thunderstorms
20.
People who own cows and other animals that eat grasses create plans to move these animals over time. They move the animals from one area to another so they can eat grasses in different places. This allows grasses to continue to grow. Why is it important to have a plan for grazing animals that allows grasses to grow in a healthy way?
a)
It causes soil erosion and allows for
planting of new species.
b)
It
prevents the dispersal of seeds and the overgrowth of plants.
c)
It
protects the predators in an area by providing plants to eat.
d)
It
protects the soil so plants will continue to grow; food will be available for
herbivores.
21.
The Coqui frog is native to Puerto Rico. These frogs were accidentally introduced in Hawaii. Coqui frogs are extremely noisy; since they are nocturnal they make loud noises at night. Although these frogs are small, they eat a lot! They eat insects and spiders that are also eaten by birds in Hawaii. Besides being noisy, how do these frogs most likely harm other animals?
a)
By causing other animals to reproduce
more.
b)
By competing with other animals for food.
c)
By
eating foods that no other animals eat.
d)
By
moving slower than most other animals.
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