McGraw Hill Ch7L1 and L2

Wildfires can burn vast areas of vegetation. Because producers, such as plants, are the base of every ____ ___ , the transfer of energy in ecosystems is greatly disrupted by wildfires.

(a)  

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NGSS.MS-LS2-3

NGSS.MS-LS1-6

Examine the food web. Which organism(s) would be directly affected if humans started to use a new pesticide that killed all the frogs?

• owls

• grasshoppers

• snakes

• birds

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NGSS.MS-LS2-4

NGSS.MS-LS2-1

NGSS.MS-LS2-2

Examine the food web. You suspect that the population of black-footed ferrets is gradually decreasing. Which species will be most affected by this decrease in the black-footed ferret population?

• rabbits

• prairie dogs

• owls

• foxes

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NGSS.MS-LS2-4

NGSS.MS-LS2-1

NGSS.MS-LS2-2

Which statement about the effect of natural disasters on ecosystems is not correct?

• Natural disasters can sometimes benefit species.

• Natural disasters completely stop the transfer of energy in food webs.

• A decrease in resources following a natural disaster can disrupt the flow and transfer of energy in the ecosystem.

• Natural disasters may cause population changes and make it difficult for species to survive.

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NGSS.MS-LS2-4

NGSS.MS-LS2-3

NGSS.MS-LS2-1

Examine the food web of an African savana. Which statement describes what would likely happen if a new disease killed most of the antelope?

• The amount of energy available to the populations of leopards and lions would increase, reducing their population size.

• The population size of most trees and grasses would decrease because other primary consumers would eat them.

• Populations of other primary consumers (insects, giraffes, oragutans and zebras) would increase because there would be less energy available to them.

• The amount of energy available to the populations of leopards and lions would decrease, reducing their population size.

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-3

NGSS.MS-LS2-1

NGSS.MS-LS2-2

How does a decrease in predators most likely affect the prey population?

• The prey population will increase.

• The prey population will decrease.

• The prey population will remain the same.

• The prey population will go extinct.

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NGSS.MS-LS2-4

What is the primary difference between primary and secondary succession?

• Primary succession occurs in an area with existing soil, while secondary succession starts on bare rock.

• Primary succession starts on bare rock, while secondary succession occurs in an area with existing soil.

• Primary succession involves only animal species, while secondary succession involves only plant species.

• Primary succession occurs faster than secondary succession.

Which of the following is a likely consequence of removing a top predator from an ecosystem?

• Immediate extinction of all species in the ecosystem.

• No change in biodiversity.

• Decreased biodiversity due to overpopulation of prey species.

• Increased biodiversity due to less competition.

Tags

NGSS.MS-LS2-4

What happens to the energy as it moves up the food chain?

• It increases.

• It decreases.

• It remains the same.

• It cycles back to the producers.

Tags

NGSS.MS-LS2-3

An ecosystem that is undergoing primary succession has mostly lichens, ferns, and mosses growing on it. What stage of primary succession is this ecosystem?

• intermediate successional stage

• climax community

• any stage of succession

• early successional stage