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Resource Availability in Ecosystems

Total questions: 16

Worksheet time: 37mins

Name
Class
Date
1.
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
2.
A meadow has too many rabbits. What would help balance this ecosystem?
a)
more rain that grass needs
b)
more foxes that eat rabbits
c)
fewer foxes that eat rabbits
d)
more grass for the rabbits to eat
3.
The Texas Kangaroo Rat, native to north-central Texas, makes its home in mesquite bushes.  If the mesquite bushes are cleared for human homes , which of the following is the most probable result?
a)
The rat population will rise (increase).
b)
The rat population will decline (decrease).
c)
The rat population will stay the same.
d)
The rat population will double.
4.
Biologists observe and record  the deer population.  They notice that the population is four times the 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.
5.
Scientific research shows that as tundra vegetation zones continue to move northward with the changing climate, caribou and reindeer may have a more difficult time finding food.  Which prediction below best explains the effect of this change on caribou and reindeer?
a)
Caribou and reindeer populations may increase because of their dependence on tundra vegetation.
b)
Caribou and reindeer populations will not be affected by this change to the ecosystem.
c)
Caribou and reindeer populations may decline because of their dependence on tundra vegetation. 
d)
Caribou and reindeer populations will increase as the food supply decreases.
6.
Which of the following would be the most likely effect, if there were a sudden increase in the cricket population?
a)
There would be a decrease in the small bird population.
b)
There would be a decrease in the grass/flowers population.
c)
There would be a decrease in the mice population.
d)
There would be an increase in the grass/flowers population.
7.

Water, Shelter, an Food are the needs of organisms in an environment.

a)

True

b)

False

8.

What do plants require in an ecosystem?

a)

Animals eating them

b)

Sunlight to grow

c)

Humans chopping them down

9.
Which of the following is not true about invasive species?
a)
They are not native to an ecosystem
b)
They create competition for resources
c)
They are always bad for the ecosystem
d)
They often do not have natural predators in new environment
10.

What would most likely happen if an ecosystem no longer received sunlight?

a)

The number of herbivores would increase

b)

The number of plants would increase

c)

all organisms would adapt

d)

All living organisms would eventually die

11.
Why would an animal migrate, or go somewhere else, during the winter?
a)
To find food
b)
It has a new job.
c)
It wants a different home
d)
To go on vacation
12.

Which of these is the most likely reason that a population in an ecosystem could have a sharp decline?

a)

The abiotic resources in the environment suddenly drops

b)

The competition for the same resource suddenly drops

c)

The number of predators suddenly decreases

d)

The number of prey suddenly increases

13.

Which of these events can lead to an increase in a population size of mice?

a)

A large number of mice die because of a forest fire

b)

New predators are added to the ecosystem

c)

More mice are born than die

d)

Some mice emigrate in search of food

14.

How can prey and predators be limiting factors for a population?

a)

Too many predators can limit a population

b)

Too little predators or too many prey can decrease a population

c)

Predators and prey limit popuations

d)

Too many predators or too little prey can decrease a population

15.

How can a drought affect a population?

a)

Droughts affect plant life and animals also need water to drink

b)

Droughts only affect plants

c)

Droughts are a dangerous period of extreme rainfall

d)

Animals die of thirst

16.

The best name for something that limits the size of a population

a)

Food

b)

Water

c)

Air

d)

Limiting factor

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