Human Impact and Biodiversity

Which answer choice is true regarding human impact and the biodiversity of ecosystems? Select 2 answers.

• We need to be careful not to take too many natural resources at one time, causing overexploitation.

• We humans have respected all ecosystems and rarely overexploit resources.

• Our world is “good to go” and every ecosystem has a stable environment.

• Due to the overexploitation of many of the natural resources our planet has to offer, we are now

  dealing with decreased biodiversity.

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

• Increase in producers

• Introduction of a non-native species

• Increase in predators

• Removal of an invasive species

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When a non-native species is introduced to a new ecosystem and begins to cause harm, it is then referred to as a/an…

• Invasive species

• Native species

• Native population

• Monoculture

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Invasive species cause damage to ecosystems by…

• Decreasing biodiversity

• Increasing native plant or animal populations

• Increasing biodiversity

• Outcompeting native species, causing the native species to decrease

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Biodiversity is…

• the variety of life in an ecosystem

• having mainly one type of species in an ecosystem

• having different kinds of abiotic factors

• an ecosystem with many natural resources

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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 rainforest has an unhealthy ecosystem because its biodiversity is too great

• an ecosystem is healthier when it has more biodiversity

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

  
  

How could an ecosystem’s biodiversity decrease?

• an increase in a predator population

• a decrease in a predator population

• one species decreases due to disease, and causes food scarcity for other species

• an invasive species is removed out of its non-native habitat

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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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Which ecosystem below describes a stable ecosystem?

• An invasive species decreased the amount of biodiversity by half

• An 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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Habitat fragmentation occurs when...

• an ecosystem is able to recover, or adjust easily to change.

• smaller fragments of a habitat join to make a large habitat.

• the temperature of ocean water causes algae to leave coral reefs.

• a large area of habitat is broken up into smaller isolated areas.

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