WorksheetsHMH Dimensions Unit 4 Energy and Matter in Ecosystems Pretest
Total questions: 10
Worksheet time: 5mins
. Which of these is a nonliving part of an ecosystem?
fish
snail
water
. lily pad
What is the role of nonliving things in an ecosystem?
They are food for the plants and animals.
They prevent competition among populations.
They determine which plants and animals can live there.
They help control the effect humans might have on the ecosystem.
Which of these is an example of an invasive species?
Ants move soil to build their homes.
The roots of a tree break apart rock in the ground.
Woodpeckers search for insects in trees by pecking holes into bark.
People brought cane toads from South America to Australia to eat pests.
Which factor could vary between ecosystems and might limit the number of organisms a forest ecosystem can support?
the amount of air in the ecosystem
the slope of the hills in the ecosystem
the number of eggs a bird lays one spring
the number of sunny days that occur in a year
Newly introduced plants compete with native plants for resources. Which statement describes what is likely to happen to native plants that compete with fast-growing newly introduced plants?
Their numbers will decrease.
Their numbers will stay the same.
Their numbers will increase slightly.
Their numbers will increase greatly.
The diagram shows organisms found in a wetland. Which consumers compete for the same food?
fish and crane
mouse and frog
crane, fish, and snail
snail, mouse, and grasshopper
Sasha drew a diagram of living and nonliving parts of an ecosystem. Which labels would most improve this diagram?
air and water
prey and predator
producer and bacteria
sunlight and consumer
This diagram shows the movement of matter between some living and non-living things in a forest ecosystem. Which part of the food chain is nonliving?
sun
berry plant
. jackrabbit
bobcat
In which way do the two consumers in this ecosystem help the producer?
They release waste that the plant uses for nutrients.
They release gases that allow sunlight to reach the plants.
They eat the plant, spreading the plant’s seeds in their waste.
They act as decomposers, breaking down materials into minerals the plant needs.
Which of these is most likely to happen if people placed more jackrabbits in this forest?
The number of berry plants will increase.
The jackrabbits will compete with the bobcats for food.
The jackrabbits will compete with each other for food.
The amount of energy available to the bobcat will decrease.
