NGSS.MS-LS2-4

Which species would be most affected by the overfishing of Alaskan salmon?

• bears
• crayfish
• lobsters
• opossum

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NGSS.MS-LS2-4

Which ecosystem is more sustainable?

• Community 1

• Community 2

• Same

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NGSS.MS-LS2-4

In 2005, the government of Brazil released information showing that over 10,000 square miles of the Amazon rain forest had been destroyed. Cattle ranching is the leading cause of deforestation reported by the Brazilian government. What will most likely be the immediate result of deforestation in the Amazon rain forest?

• a decrease in the use of alternative energy

• an increase in biodiversity in the region

• a decrease in the rate of soil erosion

• an increase in atmospheric carbon dioxide

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NGSS.MS-LS2-4

Invasive species --- [choose 3]

• take over the habitat of other organisms.

• increases the populations of native organisms.

• decrease biodiversity.

• increase biodiversity.

• cause the populations of native organisms to decrease.

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NGSS.MS-LS2-4

In the Arctic region, polar bears eat seals, and seals eat cod (a type of fish). In the last 7 years, the sizes of all the populations stayed stable, but recently the size of the polar bear population decreased. What will likely happen to the cod population?

The size of the cod population will . . .

• increase

• stay the same

• decrease

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NGSS.MS-LS2-4

Look at the diagram of the food web. The arrows means “eaten by.”

What will happen if the number of snakes decreases (goes down)?

• The owl will eat the grass

• The number of frogs will go down

• The hawk and owl will have less food

• The number of mice and grasshoppers will go up.

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NGSS.MS-LS2-4

If humans destroys all of the Sea Turtles nesting sites, what is going to happen to the Sea Turtles?

• Increase

• Decrease

• Stay the same

• Sea Turtles don't need to nest

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NGSS.MS-LS2-4

If a lake has excess levels of phosphates and nitrates in its water, what will most likely result?

• The temperature of the lake water will decrease.

• The turbidity levels of the lake will decrease.

• The dissolved-oxygen levels in the lake will increase.

• The growth of algae in the lake will increase.

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NGSS.MS-LS2-4

An environmental change drastically reduced the population of milkweed plants in an area. The milkweed plants provided the only source of food for a nearby population of monarch butterfly caterpillars.

Which statement describes the most likely effect of this environmental change on this population of monarch butterflies?

• The number of monarch butterflies will decrease because their caterpillars will not have enough food.

• The number of monarch butterflies will stay the same because butterflies reproduce so rapidly their populations can withstand most food shortages.

• The number of monarch butterflies will stay the same because their caterpillars will begin consuming nectar from different types of flowers.

• The number of monarch butterflies will increase because their reproduction rate will increase to ensure some individuals survive.

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NGSS.MS-LS2-4

Parus major is a bird species that depends on caterpillars as a food source for its young. Caterpillars are most abundant during spring. The yearly increase in temperatures during springtime has gradually shifted, resulting in caterpillars developing approximately two weeks earlier than in the past. 

How will the changes in the availability of caterpillars most likely affect future populations of P. major? 

• P. major will change their food source to plant leaves. 

• P. major will lay their eggs earlier in the year. 

• P. major will decrease the number of eggs laid at a time. 

• P. major will hunt caterpillars earlier in the day when temperatures are cooler. 

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NGSS.MS-LS2-4