Science Final

Which of these explains why an ecosystem is healthy when it has a variety of species?

• An increased number of species allows for fewer food chains.

• A larger number of species reduces competition for abiotic resources.

• A larger number of species allows for greater diversity in interdependence.

• An increased number of species contributes to greater chances for adaptability.

Tags

NGSS.MS-LS2-5

According to the Environmental Protection Agency, water is unsafe to drink if nitrate concentrations are above 10 parts per million (ppm). Science students at Concord High tested the water for nitrates in eight private wells. Their results are shown below.

Given the EPA standard, how many of these wells have water that is unsafe to drink?

• 2

• 3

• 4

• 6

Tags

NGSS.MS-PS1-2

Which gas makes up the greatest percentage of Earth’s atmosphere?

• argon

• nitrous oxide

• nitrogen

• carbon dioxide

Scientists noted that muscles and bones would need physical stress to remain healthy during manned space flights. Which of these had to be planned for because of this need?

• practicing space walking

• counseling activities for tension

• exercising to maintain strength

• monitoring circadian rhythms

Tags

NGSS.HS-ETS1-3

What is the main difference between a chemical change and a physical change?

• Chemical changes are reversible, physical changes are not

• Physical changes create new substances, chemical changes do not

• Chemical changes create new substances, physical changes do not

• Physical changes involve energy, chemical changes do not

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the result of a chemical reaction between vinegar and baking soda?

• Water

• Carbon dioxide gas

• Oxygen gas

• Hydrogen gas

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a chemical property of matter?

• Color

• Density

• Flammability

• Melting point

The diagram below shows a cross section of land. Numbers show four zones in this diagram.

Which set of labels below accurately identifies the zones that are shown?

• 1—groundwater zone; 2—unsaturated zone; 3—water table; 4—surface water

• 1—unsaturated zone; 2—surface water; 3—groundwater zone; 4—water table

• 1—water table; 2—surface water; 3—groundwater zone; 4—unsaturated zone

• 1—unsaturated zone; 2—groundwater zone; 3—water table; 4—surface water

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-4

Which of these conditions is most responsible for Earth having an environment that supports life?

• oceans regulating climate on land

• the percentage of nitrogen in the atmosphere

• water that exists in all three physical states of matter

• erupting volcanoes moderating atmospheric temperatures

Tags

NGSS.MS-ESS2-4

Biodiversity can include genetic diversity within a population or variation of populations within an ecosystem. Given this information, which of the following is likely to have the most biodiversity?

• a tropical forest

• an arctic tundra

• a deciduous forest

• a residential backyard

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-5