Science
The desert is a system because_______________.
a. it has parts that work together for a purpose
b. it contains mostly plants
c. each part of the desert is independent.
a. The desert is a system because it has parts that work together for a purpose.
Which of the following things that animals need travel through a food chain?
a. herbivores
b. nutrients and minerals
c. air and sunshine
b. nutrients and minerals travel through a food chain
What is one way people can disturb the balance of ecosystems?
a. breathing air
b. building houses
c. planting trees
b. building houses
Rocks, sunlight, air, soil, climate, precipitation.
They are all ________ factors.
abiotic or nonliving factors
Which adaptation would be most useful to an animal living in the hot desert?
a. being nocturnal
b. lots of fat for insulation
c. thick fur
a. being nocturnal
The best description of an ecosystem is____.
a. A system where populations stay the same.
b. anywhere there is only one kind of organism
c. a system where living and nonliving things interact.
What is a decomposer?
a. a dead plant or animal
b. a consumer that gets energy by eating only plants
c. an organism like an insect that eats the remains of animals
c. an organism like an insect that eats the remains of animals
What is an omnivore?
a. a animal that is a producer
b. an animal that eats only plants
c. an animal that eats both plants and animals
c. an animal that eats both plants and animals
An organisms role or job in an ecosytem
niche
Which adaptation would be most useful to a plant living in the hot desert?
a. large leaves to attract sunlight
b. waxy leaves to retain water
c. roots that grow above ground
b. waxy leaves to retain water
Which adaptation would be most useful to an animal whose niche is eating nectar from plants?
a. fins
b. wings
c. fast legs
b. wings
What is most likely to happen if most of a population of animals dies of disease?
a. the food web will stop
b. the decomposers will die
c. the food web will change
c. the food web will change
How do decaying organisms in a swamp help create the next generation of organisms?
a. the decaying organisms create a new habitat
b. they put minerals back into the soil
c. the do not help at all
b. they put minerals back into the soil
What is a consumer?
a. an organism that makes its own food
b. an organism that must eat other organisms to get energy
c. an organism that does not need to eat
a consumer is an organism that must eat other organisms to get energy (b)
What is a food web?
A system of overlapping food chains
What is the main energy source for life on Earth?
sunlight/the sun
A meadow has too many rabbits. What would help BALANCE this ecosystem?
a. more grass for rabbits to eat
b. more foxes to eat rabbits
c. fewer foxes to eat rabbits
b. more foxes to eat rabbits
This ecosystem means "treeless plain"
tundra
Which of these are consumers?
a. plants
b. trees
c. birds
c. birds
How do producers make their own food?
a. from plants
b. from the sun
c. they buy it from the lunch line
b. from the sun
What is the best explanation for a decrease in a population of birds in a community?
a. the amount of food decreases
b. the amount of space increases
c. the amount of water increases
a. the amount of food decreases.
This decrease in food would cause the organisms to compete for food resources.
What might be a reason an animal becomes extinct?
a. it is a predator
b. it adapts to its environment
c. its habitat is destroyed
c. its habitat is destroyed
An organism's "address"
habitat
Why do organisms survive in an ecosystem?
a. most of their needs are met
b. some of their needs are met
c. all of their needs are met
c. all of their needs are met
Define adaptation.
A feature or behavior that living things must do or have in order to survive in their environment.