8th Science STAAR Review 2

Where are the genes for the physical traits of an organism located?

• on a strand of RNA

• on a chromosome

• inside a hormone

• inside a carbohydrate

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NGSS.MS-LS3-1

A certain type of mite is a parasite of honeybees. Which statement best describes the relationship between the mites and the bees?

• The mites harm the bees by feeding on their blood.

• The mites get honey in return for helping the bees stay healthy.

• The mites help the bees find food but get nothing in return.

• The mites live in the hive of the bees but do not interact with the bees.

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NGSS.MS-LS2-2

An atom of which element is represented by the model below?

• Carbon

• Boron

• Lithium

• Oxygen

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NGSS.MS-PS1-1

Which of the following best describes an electron?

• It has no charge and about the same mass as a proton.

• It has a negative charge and much less mass than a proton.

• It has a positive charge and much more mass than a neutron.

• It has a negative charge and about the same mass as a neutron.

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NGSS.MS-PS1-1

To express the distance between the Milky Way galaxy and other galaxies, the most appropriate unit of measurement is the –

• meter.

• kilometer.

• light-year.

• astronomical unit.

Which of these describes a divergent boundary?

• Two continental plates moving away from each other, forming a rift valley

• Two oceanic plates rubbing against each other, forming a mid-ocean ridge

• Two continental plates colliding, forming a mountain range

• Two oceanic plates colliding, forming a volcanic arc

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NGSS.MS-ESS2-3

Different species of carnivorous animals that share the same habitat in an ecosystem may –

• become decomposers

• compete for biotic food

• produce their own food

• mate with each other

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NGSS.MS-LS2-2

What is one way humans are trying to positively impact the ocean?

• Fishing

• Creating artificial reefs

• Harvesting oil and natural gas

• Transporting goods in ocean vessels

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NGSS.MS-ESS3-3

NGSS.MS-LS2-5

A scientist spilled a few drops of dilute hydrochloric acid (HCl) on a lab table. For safety purposes, the scientist sprinkled some baking soda (NaHCO3) onto the spill. Which observation would provide the best evidence that a chemical reaction occurred?

• The baking soda and hydrochloric acid combined, and bubbles formed.

• The baking soda absorbed the hydrochloric acid.

• Some of the baking soda dissolved in the hydrochloric acid.

• The hydrochloric acid evaporated, leaving only the baking soda.

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NGSS.MS-PS1-2

Hay is made up of organic compounds.

What are the main elements in many organic compounds?

• Helium, carbon, sodium

• Sodium, hydrogen, nitrogen

• Carbon, hydrogen, oxygen

• Radon, oxygen, helium

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NGSS.MS-PS1-1