Unit 3 Test Review: 7th grade Science

All food chains begin with a _____.

• decomposer

• producer

• consumer

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Decomposers ___.

• add nutrients to the soil

• feed on dead animals

• include bacteria

• all of the above

Tags

NGSS.MS-LS2-3

In _____ both organisms benefit.

• parasitism

• commenslism

• mutualism

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NGSS.MS-LS2-2

Heartworms can infest the hearts of animals like cats and dogs. The worms get nutrients from the animal, while the animal will die from the infestation. This is an example of _____.

• parasitism

• commensalism

• mutualism

Choose all the answers that apply. (4 correct choices)

Producers:

• release oxygen into the air

• release carbon dioxide into the air

• make their own food using photosynthesis

• get their energy directly from the sun

• are the start of all food chains

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

In the following food chain, which organism receives the least amount of energy?

plankton ⇒ shrimp ⇒ fish ⇒ seal

• plankton

• shrimp

• fish

• seal

Tags

NGSS.MS-LS2-3

Choose all the answers that apply. (4 correct choices)

Energy in an ecosystem:

• flows only one way

• is part of an open system

• is recycled and reused

• is eventually lost as heat

• is transferred through the food chain

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Choose all the answers that apply. (3 correct choices)

Matter in an ecosystem:

• must be continuously replenished

• is part of a closed system

• is recycled and reused

• is returned to the earth by decomposers

• is always decreasing

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which of the following statements is true?

• Secondary consumers are always carnivores.

• As population density increases, competition for resources decreases.

• A sparrow and a caterpillar both live in the same tree. They share a niche.

• Secondary consumers receive less energy from the food chain than primary consumers.

Tags

NGSS.MS-LS2-3

Wildflowers bloom in early spring so they are not shaded by trees, which grow their leaves back later in spring. This is an example of competition for _____.

• temperature

• light

• soil

• water

Tags

NGSS.MS-LS2-1