5.3b

Which statement is correct about the role of humans in the food web?

• Humans occupy a top position because they eat different types of organisms.

• Humans occupy a top position because they are not eaten by any other organisms.

• Humans occupy the same position as the octopuses because both feed on mussels.

• Humans occupy the same position as the seagulls because both live on land.

Answer explanation

Humans do not typically have predators.

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NGSS.MS-ESS3-4

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The image shows a grassland food web. As a result of pollution caused by human activities, a bacterial infection has caused a decline in the population of weasels. How will the decline in the population of weasels likely impact the food web?

• The number of grasshoppers will increase.

• The number of plants will decrease.

• The number of shrews will decrease.

• The number of spiders will increase.

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Which activity would most likely pollute a river?

• building a bridge over the river

• spreading fertilizer near the river

• fishing in the river

• beavers building a dam in the river fishing in the river

Answer explanation

Fertilizer can be washed down into the river- causing pollution of the water.

Tags

NGSS.MS-ESS3-4

What can be inferred about the rabbit and fox populations?

• The fox population decreased over seven years.

• The rabbit population increased over seven years.

• The rabbit population decreased because the fox population increased.

• There is no connection between the rabbit and fox populations.

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The southern fox squirrel makes its habitat in mature pine and pine-hardwood trees. What would most likely happen to the southern fox squirrel population if the pine and pine-hardwood population was to be cut down for farmland?

• The southern fox squirrel population will decrease because of the loss of its habitat.

• The southern fox squirrel population will increase because of an increase in the food available on the farm.

• The southern fox squirrel population will increase because the removal of the tree population will create more space.

• The southern fox squirrel population will remain the same after the land has been cleared.

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NGSS.MS-LS2-1

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Which change is most likely to have a positive effect on the population of the Bobcat in the ecosystem?

• increase in the population of the Mountain Lion

• increase in the population of the Mountain Goat

• decrease in the population of the Mouse

• decrease in the population of the Rabbit

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The diagram shows an aquatic food web.

The population of shrimp is reduced due to a sudden change in the climate. Does this decrease have any effect on the population of alligators?

• Yes. The alligator feeds on shrimp when other food sources are unavailable.

• No. The alligator is the top predator and will be unaffected by the decline of shrimp.

• Yes. The population of catfish and pike that are food for the alligator will decrease.

• No. The population of organisms on which the alligator feeds would remain the same.

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What is least likely to reduce the population of the woodlouse?

• increase in the population of the shrew

• decrease in the population of the centipede

• decrease in the population of the ladybug

• increase in the population of the greenfly

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NGSS.MS-LS2-2

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What explains the immediate effect of removing the elk population from the ecosystem?

• The population of the lion will increase

• The population of the bat will decrease.

• .The population of the deer will decrease.

• The population of the wolf will increase.

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The diagram shows a grassland ecosystem.

The grasshopper population decreases due to disease. What change would most likely be observed in the populations of the beetles and snails and why?

• They will decrease, as they will feed upon each other.

• They will increase, as the owl population will feed on more of the shrew and wood mouse populations.

• They will decrease, as the wood mouse and shrew populations will feed on more of them

• They will increase, as there will be more of the green plant population for them to feed upon.

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