8.11a B C

• A
• B
• C
• D

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Four students were asked to create a graph representing a typical predator–prey relationship. Which graph shows a situation in which the number of predators in a population depends on the number of prey?

• 
• 
• 
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NGSS.MS-LS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Volcanic Eruption

• Short Term

• Long Term

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS3-2

If an invasive plant grows in a forest, then:

• sunlight is more abundant.

• native plant growth decreases.

• windy days increase.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of the following human activities will have the greatest negative impact on the balance of organisms within ocean ecosystem?

• monitoring of major, global ocean currents

• recreational boating

• commercial fishing to provide food for humans

• mapping of the ocean floor by marine scientists

Tags

NGSS.MS-LS2-4

Large nets are used to capture fish. These nets often catch unnecessary species that are not used by humans. What change could lessen the negative effect of using large nets for commercial fishing?

• exploring new and uncharted areas of the ocean where the nets can be used

• using nets in deeper regions of the oceans where different organisms live

• designing nets that release unwanted species without harming them

• decreasing the size of the nets, but using more of them

Tags

NGSS.MS-ESS3-3

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-LS2-5

A scientist added bacteria and a nutrient medium that could support the growth of the bacteria to a sterilized petri dish. No other materials were added. The graph models growth of the bacteria over time. Which of these most likely explains why the bacterial population stopped growing?

• The bacteria competed for nutrients and died after all the nutrients were consumed.

• The bacteria did not reproduce in the system, and eventually each individual died at the end of its life cycle.

• The bacteria mutated from photosynthetic to carnivorous organisms and consumed one another until all the individuals were dead.

• The bacteria became diseased and were unable to survive in the closed system.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Barnacles are marine organisms that live attached to surfaces as adults. A scientist studies two barnacle species that live on rocks on a coast in Scotland. In some rocky areas Species A is found alone. In other rocky areas Species B is found alone. In still other rocky areas both species are found together. The diagram below shows the two barnacle species on rocks in their habitats.

If Species B were removed from the rocky areas it shares with Species A, Species A would most likely inhabit —

• Zone I only

• Zones I and II only

• Zone III only

• Zones I, II, and III

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

A scientist named Joseph Connell studied two species of barnacles on the shore of a Scottish island. In the area between the average tide and the neap high tide, he found that the population of Species A was smaller than that of Species B. He removed Species B from one area but left both Species A and B in a similar area. The graph below shows the results of this study. Based on these data, which hypothesis was Connell most likely testing?

• The populations of both species of barnacles increase more in warm water than in cool water.

• Barnacles grow larger when they are isolated from other species.

• The two species of barnacles compete with each other for resources.

• The two species of barnacles are closely related to each other.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

The graph below shows the percent of seeds from two plant species that sprout when grown in water containing different amounts of salt. Which of the following best summarizes the effect of saltwater on these plant species?

• Species 1 can sprout only in freshwater, and Species 2 can sprout only in saltwater

• Both species can sprout in freshwater and saltwater, but Species 2 can sprout in a higher salt concentration than Species 1.

• Both species need salt in their water, but Species 2 needs more salt than Species 1.

• Species 1 can sprout only in water with a low salt concentration, but Species 2 is not affected by the salt concentration.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1