8.L.3.3

In which process is nitrogen from the air put into a form that plants can use?

• nitrogen fixation

• nitrification

• denitrification

• nitrogen saturation

Which factor BEST explains why biomass decreases as trophic level increases in a food pyramid?

• Some of the energy is converted to heat.

• The survival rate of organisms gradually decreases.

• The availability of space decreases as feeding levels increase.

• Toxic chemicals get concentrated as they move up the food web.

Tags

NGSS.MS-LS2-3

Consider this food web: Where is the largest amount of energy found in this food web?

• grass

• hawk

• mouse

• grasshopper

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

The diagram shows a food web for an ocean ecosystem. How would an increasing shark population most likely affect this ecosystem?

• The octopus population would decrease.

• The algae population would decrease.

• The limpet population would decrease.

• The seagull population would decrease.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

List the steps of the scientific method

d

e

f

c

b

a

Ask a question

Communicate results

Conduct experiment

Draw conclusions

Form a hypothesis

Analyze results

Tags

NGSS.MS-LS1-5

Matter cycles between the environment and living organisms in a complex web of interactions. Which organisms provide the important link in Box A from dead organic matter to matter from the environment?

• decomposers

• autotrophs

• parasites

• photosynthesizers

Tags

NGSS.MS-LS2-3

An energy pyramid is illustrated. Which statement BEST explains the flow of energy as it moves through the different levels?

• Energy decreases as it is lost as heat to the environment.

• Energy increases as it is gained from the environment.

• Energy is unavailable because it is used up by the organisms at Level 1.

• Energy is transferred as it is produced by organisms in the next level.

Tags

NGSS.MS-LS2-3

Mountain pocket gophers are native to Nevada. Which activity of the gopher transfers energy from one trophic level to another in its ecosystem?

• eating the roots of many plants

• reproducing with other gopher species

• storing food underground

• digging burrows to live in

Tags

NGSS.MS-LS2-3

The organisms shown live in the same habitat. Which BEST describes the exchange of energy between the organisms?

• One organism obtains energy from the environment, while the others obtain energy by eating other organisms.

• Each organism obtains energy from the environment.

• Each organism obtains energy by eating other organisms.

• One organism obtains energy by eating other organisms, while the others obtain energy from the environment.

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3

The diagram shows some organisms in an Antarctic food chain. Which BEST describes the role of krill in this food chain?

• primary consumers

• producers

• decomposers

• secondary consumers

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3