L.2.1

Which situation best demonstrates the decomposition process where organic material is recycled in an ecosystem?

• a hawk eating a mouse

• worms tunneling through soil

• bacteria feeding on dead plants

• a plant using nitrogen to make proteins

Tags

NGSS.MS-LS2-3

How are bacteria in the soil beneficial in returning nutrients to a forest ecosystem?

• They decrease photosynthesis in plants, allowing nutrients to be

  conserved.

• They break down dead plants, allowing nutrients to return to the soil.

• They stop the flow of energy in the forest food web and prevent

  nutrients from being lost to the atmosphere.

• They help animals digest the plants they consume and convert the

  nutrients into energy.

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3

What do herbivores and carnivores have in common?

• They are scavengers.

• They are consumers.

• They are producers.

• They are omnivores.

Which organisms in a food web are using carbon dioxide released by consumers?

• decomposers and other consumers

• producers

• producers and other consumers

• decomposers

Tags

NGSS.MS-LS1-6

What does a food web represent?

• the methods consumers use to get food

• the specific ways that mutualism occurs

• a single pathway of energy flow between organisms

• energy flow through organisms connected within an ecosystem

Tags

NGSS.MS-LS2-3

This shows a food chain.

sun → wheat → mouse → snake → owl

Which population of organisms has the most available energy in this food

chain?

• wheat

• mouse

• snake

• owl

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which energy source begins each food chain?

• fire

• soil

• wind

• sunlight

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

This is a food chain in a grasslands ecosystem.

sun → grass → rabbit → fox → hawk

Additional foxes are introduced into this ecosystem. Which population will immediately decrease?

• grass population

• rabbit population

• fox population

• native fox population

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which phrase best explains what the arrows in a food web indicate?

• chemical reactions within organisms

• direction of food movement

• flow of energy

• production of food

Tags

NGSS.MS-LS2-3

A bear in a forest ecosystem eats both berries and fish. Which statement

best describes how the bear is involved in energy transfer within this

ecosystem?

• The bear releases energy that is transferred to the fish when the bear

  catches them.

• The berries produce energy that is transferred to the bear when he

  eats them.

• The bear releases energy as it is transferred to the berries and the

  fish.

• The bear produces energy and transfers it to the berries and the fish.

Tags

NGSS.MS-LS2-3