LS4.1 Ecosystem Stability

Which answer option would pose the largest threat to an ecosystem?

• Increase in producers

• Introduction of a non-native species

• Increase in predators

• Eradication of an invasive species

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NGSS.MS-LS2-4

Which answer is true regarding biodiversity?

• As long as there are enough producers, an ecosystem is considered to have a good amount of biodiversity.

• The rain forest has an unhealthy ecosystem because its biodiversity is too great.

• An ecosystem is healthier when the biodiversity is great.

• Biodiversity is positively affected when non-native species are introduced into an environment

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Which 2 answers are true about stable ecosystems?

• Healthy ecosystems have a stable balance between producer and consumer populations.

• Stable ecosystems have more consumers than they can support.

• If one species dies out due to disease in a stable ecosystem, the ecosystem should still remain stable.

• Stable ecosystems have too many producers.

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NGSS.MS-LS2-4

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Which of the following is a list of natural resources?

• coal, natural gas, books, tile

• water, lumber, minerals, coal

• rivers, deer, purses, shoes

• rabbits, waterfalls, geothermal energy, socks

How might logging impact this ecosystem?

• Birds will increase

• Squirrels will increase

• Insects and birds will decrease

• Insects and birds will increase

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NGSS.MS-LS2-4

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How would a decrease in fungi and bacteria impact the anthropod shredders (insects)?

• The anthropod shredders will increase

• The anthropod shredders will decrease

• The population numbers will stay the same.

• None of the above

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NGSS.MS-LS2-4

NGSS.MS-LS2-1

Which ecosystem below describes a stable ecosystem?

• An invasive species decreased the amount of biodiversity by half

• This ecosystem’s deer have increased due the loss of a predator population, now the producer population has decreased by ¼.

• This ecosystem suffered a tornado, but due to great biodiversity, it was able to be restored.

• This ecosystem is impacted by overfishing, causing 3 fish species to become extinct.

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NGSS.MS-LS2-4

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Which answer is correct regarding the maintenance of biodiversity? (multiple select – 2 answers)

• We need to be careful of over-exploitation, such as overfishing and overmining.

• We humans have respected our planet and are rarely involved in over-exploitation.

• Our world is "good to go" and every ecosystem is stable.

• Due to the over-exploitation of our natural resources, we are now dealing with decreased biodiversity.

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NGSS.MS-LS2-4

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What would most likely happen to the zebra population if the cheetah population was eradicated?

• The zebra population would increase greatly.

• The zebra population would decrease.

• The zebra population would decrease greatly.

• The zebra population may increase slightly, because two other predators are still present.

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NGSS.MS-LS2-4

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Describe what would happen to the zebra population and the plant population if the cheetah and hyena both left the ecosystem.

• The zebra population would decrease with the absence of predators; the plant population would stay the same.

• The zebra population would greatly increase, causing the plant population to decrease.

• The zebra population would decrease, causing the plant population to increase.

• The zebra population would greatly increase, causing the plant population to also increase.

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NGSS.MS-LS2-4

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