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Ecosystems

Total questions: 52

Worksheet time: 5hrs 51mins

Name
Class
Date
1.
A __________ includes all living and non-living things in an environment. 
a)
population
b)
niche
c)
abitotic
d)
ecosystem
2.
Which best explains why many kinds of plants and animals can live together in an ecosystem?
a)
The plants and animals are all part of a food chain and depend on each other to live.
b)
Plants and animals are interdependent of one another.
c)
One species may overpopulate, killing all plant life.
d)
Over population of a species results in a biodiversity.
3.
Which describes a decomposer?
a)
an organism that eats only plants
b)
an organism that makes its own food
c)
an organism that breaks down dead matter
d)
an organism that recieves energy from the sun
4.
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
5.
Examples of how humans negatively affect local ecosystems are
a)
Building dams, deforestation (cutting down trees), adding point sources to nearby streams to allow for run-off, building roads and structures, and salting roads.
b)
Creating laws to prohibit fishing from local streams.
c)
Planting trees and other plants to attract native species.
d)
Removing non-native species from the environment.
6.
What is the name for all the animals of the same species living in an ecosystem?
a)
Population
b)
Community
7.
Which is a non-living part of an ecosystem?
a)
Sunlight
b)
Air
c)
Water
d)
All of these
8.
Which of these is NOT an example of an ecosystem?
a)
Rainforest
b)
A city
c)
Desert
d)
Deep ocean
9.
When organisms need the same limited resources, there is ______________ .
a)
an extra resource
b)
competition
c)
extinction
d)
mutation
10.

The surroundings in which a plant or animal lives.

a)

niche

b)

habitat

c)

ecosystem

d)

environment

11.
The nonliving parts of an ecosystem include
a)
water, sun, plants
b)
rocks, water, animals
c)
rocks, sun, water
d)
animals, plants, spiders
12.
Which of the following items does not create air pollution?
a)
motorcycle
b)
bus
c)
bicycle
d)
car
13.
A new species that causes harm to an ecosystem.
a)
Pollutant
b)
Invasive Species
c)
Global Warming
d)
Deforestation
14.
A substance that makes land, water or air dirty and not safe to use. 
a)
Pollutant
b)
Invasive Species
c)
Global Warming
d)
Deforestation
15.
The act of cutting down or burning all the trees in an area. 
a)
Pollutant
b)
Invasive Species
c)
Global Warming
d)
Deforestation
16.
Increased industrialization will most likely
a)
decrease available habitats 
b)
increase environmental carrying capacity 
c)
increase the stability of ecosystems 
d)
decrease global warming
17.
Increase in which gas is primarily responsible for increased global warming?
a)
Carbon dioxide
b)
Water vapor
c)
Methane
d)
Nitric oxides
18.
Most water pollution is the result of __________________.
a)
natural processes
b)
animal waste
c)
human activities
d)
acid rain
19.
Chemicals that kill crop-destroying organisms are called _____________.
a)
sediments
b)
fertilizers
c)
acid rain
d)
pesticides
20.
Turning off lights when leaving the room is a good way to conserve
a)
trees
b)
renewable resources
c)
fossil fuels
d)
sunlight
21.
An ecosystem is made up of all the ___________ and _____________ factors in an area. 
a)
not/without
b)
Limiting Factor/ Carrying Capacity
c)
Living/ Nonliving
d)
life/ biotic factor
22.

Which of the following would be the normal habitat for an alligator?

a)

A swampy wetland

b)

A dry, sandy desert

c)

An open grassland

d)

A thick evergreen forest

23.

A large forest was destroyed by a fire several months ago. Many plants have now begun to grow where the forest once stood, and animals have once again made their homes there. What conclusion can be drawn from this information?

a)

Ecosystems never change.

b)

Although animals may return to a destroyed ecosystem, plants can never grow there again.

c)

One ecosystem can replace another ecosystem.

d)

Organisms can never survive in a changed ecosystem

24.

Which group could survive without water and sunlight?

a)

Producers only

b)

Consumers only

c)

Both producers and consumers

d)

Neither producers nor consumers

25.

A student observing birds in a park records some ways that birds interact with living and nonliving parts of their environment. All of the following observations are ways that a bird interacts with nonliving parts of its environment EXCEPT...

a)

reacting to morning sunlight by singing

b)

drinking and taking a bath in a puddle of water

c)

responding to cold temperatures by fluffing its feathers

d)

feeding insects to its chicks

26.
a)

snakes, squirrels, and raccoons

b)

squirrels only

c)

snakes, squirrels, and deer

d)

raccoons only

27.
a)

The variety of native plants decreases

b)

The water supply in the area increases

c)

Weather patterns in the area change

d)

The number of other plants increases

28.
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.
29.
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.
30.
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.
31.
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.
32.
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.
33.
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.
34.
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.
35.
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.
36.
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.
37.
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
38.
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
39.
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.
40.
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
41.
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
42.

How would building a highway affect an environment?

a)

salt water pollutes fresh water

b)

marine life is threatened

c)

animals cannot travel through their ecosystem the same

43.

If a coyote disease decreases the coyote population, then

a)

the pond floods

b)

crops are wiped out

c)

the mice population explodes

44.

If there is an outbreak of grasshoppers, then

a)

crops are wiped out

b)

the mice population explodes

c)

zebras migrate to find water

45.

Which is a man-made change to an environment

a)

pollution

b)

hurricane

c)

flood

46.

If an invasive plant grows in a forest, then

a)

sunlight is more abundant

b)

native plant growth decreases

c)

windy days increase

47.

If an organism cannot adapt or migrate when a dramatic change occurs, it may die

a)

TRUE

b)

FALSE

48.

Could dramatic change in temperature change an environment?

a)

YES

b)

NO

49.

If the drinking water in a city becomes contaminated, it is a negative environmental change.

a)

TRUE

b)

FALSE

50.

Which is a naturally occurring environmental change?

a)

building a road

b)

a chemical spill

c)

a volcano erupting

51.

If a lake was filled in because a new road was constructed,

a)

birds would have to migrate

b)

fish would likely die

c)

prairie dogs would build burrows

52.

Wild Texas hogs, similar to the one shown in the picture, are descended from hogs brought here from other countries. These wild hogs eat many different kinds of foods, including plants, fungi, and insects. Besides being very destructive to the habitats of other animals, how do wild hogs most likely harm other animals?

a)

By competing with other animals for food

b)

By moving slower than most other animals

c)

By causing other animals to reproduce more

d)

By eating foods that no other animals eat

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