Energy Flow & Matter Cycling Pre-Assessment

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What is the main source of energy for all life on Earth?

• Wind

• Water

• The Sun

• Fossil Fuels

Answer explanation

Correct! The Sun provides energy for nearly all living things.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which of the following is an example of a producer in a food web?

• Rabbit

• Hawk

• Snake

• Grass

Answer explanation

Yes! Producers like grass make their own food using sunlight.

Tags

NGSS.MS-LS2-3

If a frog eats a grasshopper that eats grass, what is the frog’s role in the food web?

• Producer

• Secondary Consumer

• Herbivore

• Primary Consumer

Answer explanation

Nice work! The frog is a secondary consumer because it eats a primary consumer.

Tags

NGSS.MS-LS2-3

How are the roles of a decomposer and a consumer different in an ecosystem?

• Decomposers eat only plants

• Consumers break down waste

• Decomposers return nutrients to the soil

• Consumers produce energy from the sun

Answer explanation

Correct! Decomposers recycle matter by breaking down waste and dead organisms.

Tags

NGSS.MS-LS2-2

What might happen to a hawk population if the population of mice in a food web decreases?

• Hawk population increases

• Hawks become producers

• Hawk population decreases

• Hawks eat only grass

Answer explanation

That’s right! Less food for hawks means fewer hawks survive.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which statement best explains how energy and matter move through a food web?

• Matter is destroyed in the food web

• Energy and matter cycle in only one direction

• Matter is reused, and energy flows from the sun through the web

• Energy and matter do not interact in food webs

Answer explanation

Excellent! Energy flows and matter cycles – that’s the big idea in ecosystems.

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3