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WorksheetsChanges in Ecosysems 5.9C
Total questions: 24
Worksheet time: 49mins
Name
Class
Date
1.
Which of these populations is most likely to decrease if the number of grasshoppers decreases?
a)
plants
b)
frog
c)
praying mantis
d)
owl
2.
Natural disasters can also change ecosystems. What can organisms do if a disaster happens?
a)
Fight, Survive, Struggle
b)
Relocate, Adapt, Die
c)
Stay, Sleep, Survive
d)
Eat, Sleep, Repeat
3.
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
4.
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.
5.
The removal of trees and plants can cause problems such as soil erosion.
a)
True
b)
False
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.
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
9.
Which of the following would have a negative impact on an ecosystem
a)
constructing highways
b)
planting trees
c)
recycling paper
10.
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
11.
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
12.
If an invasive plant grows in a forest, then
a)
native plant growth decreases
b)
sunlight is more abundant
c)
windy days increase
d)
invasive animal populations will increase
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.
In a grassland ecosystem, lions prey on wildebeest. The population of lions has declined steadily because of illegal hunting. What will most likely happen to the population of wildebeest?
a)
The wildebeest population will increase.
b)
The wildebeest population will decrease.
c)
The wildebeest population will remain the same.
15.
In a food chain, foxes are consumers of rabbits and mice. If the mice population suddenly decreases, what will most likely happen to the number of foxes?
a)
The number of foxes will increase because they will eat fewer rabbits.
b)
The number of foxes will stay the same because they will eat more rabbits.
c)
The number of foxes will decrease because they will be eaten by the rabbits.
d)
The number of foxes will decrease because they will only have one remaining food source.
16.
What would most likely happen if plant life was removed from a pond ecosystem?
a)
The level of the water in the pond would increase.
b)
The number of fish would decrease due to reduced oxygen.
c)
The amount of sunlight reaching the bottom would decrease.
d)
The number of fish would increase due to an increase in oxygen.
17.
If the population of prey increases, the population of predators will ________because of the availability of food.
a)
decrease
b)
stay the same
c)
increase
18.
Field mice eat corn. Which would most likely happen if the field mouse population grew?
a)
There would be more corn to feed the field mice.
b)
There would be less corn due to the mice eating it.
c)
The habitat would get overpopulated because the mice woudl eat too much.
19.
What is a drought?
a)
Not enough rain
b)
Too much rain.
c)
Too much people using water
d)
Strong winds
20.
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
21.
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
22.
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
23.
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
24.
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
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