7th Grade Science Final Exam

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

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NGSS.MS-LS2-5

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.

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NGSS.MS-LS2-4

NGSS.MS-LS2-5

After a forest fire, which type of organisms will begin secondary succession?

• small shrubs

• mature oaks

• evergreens

• wildflowers

A student kept a notebook during an investigation. Which recorded observation

was most likely a physical change?

• The solution was heated for two minutes until it boiled.

• A solid formed when two liquids were mixed together.

• Two solutions were mixed and the resulting solution felt hot.

• The color of two mixed solutions changed from clear to white.

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NGSS.MS-PS1-2

A rock has most likely traveled a long distance from its place of origin if it is

• very small.

• partially faded.

• rounded and smooth.

• rough and dense.

A certain species of endangered parrots lives on an island that can be seriously affected by large floods. Which of these is considered a negative impact to the parrot population from flooding?

• a decrease in the availability of food

• a decrease in populations of predators

• an increase in suitable nesting locations

• an increase in places to hide from danger

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NGSS.MS-LS2-1

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

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NGSS.MS-PS1-2

Increased human populations can lead to the depletion of locally available resources within communities. Compared to other communities, which of these locally available resources is most likely to be depleted in desert communities?

• mineral

• oxygen

• gasoline

• water

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NGSS.MS-ESS2-4

NGSS.MS-ESS3-4

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

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NGSS.HS-LS1-3