Ecosystems Unit Test

The overlapping chains in an ecosystem is a...

• food chain

• food web

• niche

• habitat

All of the following are abiotic factors except _______.

• temperature

• bacteria

• weather

• soil

The source of all the energy in a food chain comes from ______.

• producers

• consumers

• decomposers

• the sun

In an ecosystem, wolves mainly eat elk. What might happen if the population of elk got smaller (decreased)?

• there might be more competition among wolves for elk

• the wolves might start competing with organisms for other food sources

• the wolf population might get smaller (decrease)

• all the above

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

The job of decomposers is to break down dead plants and animals into useful substances. This job is their _______________ .

• adaptation

• skill

• niche

• habitat

Tags

NGSS.MS-LS2-2

Which is a model of the path that energy in food takes as it moves from one organism to the next?

• food chain

• food web

• photosynthesis

• respiration

Which one of the following is an example of an abiotic limiting factor?

• rabbits

• temperature

• plants

• bacteria

If a predator (consumer) is removed from an ecosystem, then __________.

• the population of primary and secondary consumers will likely decrease

• the population of producers will increase

• the population of primary and secondary consumers will likely increase

• all secondary consumers will be unaffected

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-2

NGSS.MS-LS2-1

NGSS.MS-LS2-4

The _______ is the continuous exchange of carbon dioxide and oxygen among living things.

• oxygen-carbon cycle

• nitrogen cycle

• water cycle

• photosynthesis

When a plant or animal is not native to an ecosystem, it is classified as an ___________.

• invasive species
• producer

• consumer

• predator