NEW
Font size
S
M
L
XL
Worksheets5.9C Environmental Changes
Total questions: 20
Worksheet time: 2hrs 50mins
Name
Class
Date
1.
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.
2.
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.
3.
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.
4.
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.
5.
Raccoons eat aquatic animals. If chemicals entered the lake with rain water and destroyed the plants, how would this impact the raccoon population?
a)
Raccoons
would have more aquatic animals to eat.
b)
Raccoons
would begin eating land plants.
c)
Raccoons
would have less aquatic animals to eat.
d)
Raccoons would only drink water.
6.
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.
7.
Which of the following would have a negative impact on an ecosystem
a)
constructing highways
b)
planting trees
c)
recycling paper
8.
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
9.
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
10.
What do scientist call organisms that are not native to an ecosystem and cause harm to native organisms?
a)
native plants
b)
invaders
c)
invasive species
d)
natural species
11.
When a certain population becomes so dense that it harms or changes the quality of life in that environment, we have...
a)
a population
b)
overpopulation
c)
pollution
12.
Which is NOT an example of a natural environmental change?
a)
a beaver dam
b)
a hurricane
c)
a volcanic eruption
d)
a housing development
13.
There are many large-mouth bass, a type of fish, living in a small lake near Waco, Texas. How would increased fishing in the lake effect the lake ecosystem?
a)
Predators of the bass might starve due to loss of a food source
b)
The population of the bass’ prey would decrease.
c)
The bass would spend more time swimming near the surface
d)
Water level in the lake would decrease as more fishing took place
14.
If a disease destroying barley plants in a field swept through an ecosystem, what would happen to the barley eating bird population in the the field ?
a)
The bird population would stay the same
b)
The bird population would increase fast
c)
The bird population would decrease
15.
When would the size of a population of animals decrease?
a)
When the number of births is less than the number of deaths
b)
When the number of births is greater than the number of deaths
c)
When the number of births is the same as the number of deaths
d)
Populations of animals are always decreasing.
16.
What factors would cause an increase in the Wolves population between 1969-1979?
a)
Disease(canine parvovirus)
b)
Decrease in the Moose population
c)
Tick infestation
d)
Mild winters
17.
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
18.
What would happen if the mouse population went extinct?
a)
The Kestrel (Hawk) population would increase
b)
The Blackberry plants would increase
c)
The Rabbit population would decrease
d)
The grass would increase
19.
What happens to the Lynx (red) population as the Hare (purple) population increases?
a)
The Lynx population stays the same
b)
The Lynx population increases
c)
The Lynx population decreases
20.
Which of these populations is most likely to decrease if the number of grasshoppers decreases?
a)
plants
b)
frog
c)
praying mantis
d)
owl
Reset
