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WorksheetsChanges in Ecosystems
Total questions: 20
Worksheet time: 22mins
An organism that feeds on and harms a living thing is called a ___________.
competition
extinct
host
parasite
A species that is _______ has no living members.
succession
extinct
hazardous waste
parasite
__________ is the struggle between organisms to meet their needs.
succession
competition
waste
parasite
A species that is at risk of dying out is an _________ species.
endangered
parasite
competition
succession
________ can be very harmful to organisms and the environment.
endangered
hazardous waste
host
endangered
The process of one community gradually replacing another community.
hazardous waste
competition
parasite
succession
A __________ is an organism that provides energy or an environment for another organism.
host
competition
extinct
succession
A pet-store gerbil has lived alone in a cage. Suppose you were to put it in a cage with two other gerbils. How can the pet-store gerbil survive in its new environment?
It must wait to eat until the other gerbils have finished.
It must build a new home.
It must compete with the other gerbils for gerbils for resources.
It must hide in the cage.
One result of two different species living in the same area and using the same limited resources is
succession.
learned behavior.
pollution.
competition.
Nonliving things that affect organisms in an ecosystem include soil, temperature, and
plants.
water.
decomposers.
parasites.
Suppose you found a rock that had imprints of water plants and shells. What does this tell you about the area in which you found the rock?
It was once under water.
It was onces in a forest.
Dinosaurs once lived there.
Many predators lived there.
Why do chipmunks in the Great Smoky Mountains survive?
Their needs are met in that environment.
They have driven out all the other chipmunks.
Humans feed them, which helps them survive.
Humans have moved them from cities to the mountains.
Which describes a balanced ecosystem?
There is enough food for people to exist.
One type of animal and plant depend on each other.
No animal or plant drives out other animals and plants.
Humans create shelter and food for animals and plants.
A meadow has too many rabbits. What would help balance this ecosystem?
more rain that grass needs
more foxes that eat rabbits
fewer foxes that eat rabbits
more grass for rabbits to eat
Which would cause an ecosystem to change quickly?
an earthquake
a lake drying up
a climate change
a lake becoming a marsh
What is one way people can disturb the balance of ecosystems?
breathing air
planting trees
riding bicycles
building houses
What might be a reason an animal becomes extinct?
It is a predator.
It produces oxygen.
Its habitat is destroyed.
it adapts to its environment.
What could scientists tell from a fish fossil found in a desert?
That fish is now extinct.
Fish once had legs to travel.
Fish once lived in dry places.
The desert was once a sea or lake.
Why did the United States establish national parks?
to make money for the national government
to provide Americans with great vacation spots
to preserve nature's beauty and habitats of plants and animals
to give Americans a chance to see things they've never seen before
How are a hawk and an owl able to succeed, even though they compete for food?
The hawk eats the owl.
The owl changes its diet.
One animal moves to a different habitat.
One hunts at night, and the other hunts during the daytime.
