Biodiversity part 2 Notes

Multiple Choice

Why is biodiversity in an ecosystem so important?

• Because it can help humans where to determine good places to develop farm land.

• Because places that have a healthy biodiversity are unaffected by major disturbances.

• Because having a high biodiversity allows ecosystems to withstand major changes.

• Because having a high biodiversity allows for fewer opportunities of competition for similar resources.

Multiple Choice

Examine the population graph for a forest ecosystem. Which of the squirrels is an invasive species? Explain

• Red Squirrel, because its numbers declined throughout the study.

• Grey Squirrel, because its numbers declined throughout the study.

• Red Squirrel, because its numbers increased throughout the study.

• Grey Squirrel, because its numbers increased throughout the study.

Multiple Choice

What effect are humans having on the rate of extinctions?

• increasing

• decreasing

• holding steady

Multiple Choice

Humans are causing extiction in which ways?

• By over hunting animals for food or products.
• By destroying the natural habitat of species.
• By polluting the environments of the world.
• All of the above.

Multiple Choice

A ______________ species is on its way to becoming endangered or extinct.

• threatened

• cuddly

• sleeping

• fossil

Multiple Choice

Species that are in danger of becoming extinct are called __________.

• endangered

• not lucky

• extinct

• in a jam

Multiple Choice

What are the classifications of at-risk species according to scientists?

• Endangered

• Threatened

• Extirpation

• All of the above

Multiple Choice

What are the leading causes of biodiversity decline?

• Habitat loss

• Climate change

• Pollution

• Overfishing

Multiple Choice

How does habitat fragmentation affect biodiversity?

• By increasing genetic diversity within species

• By facilitating easier movement of species between fragmented habitats

• By reducing the overall area available for species and isolating populations

• By increasing the number of species in each fragment

Multiple Choice

What are the main causes of biodiversity loss mentioned in the summary?

• Natural causes

• Human-caused factors

• Climate change

• Pollution

Multiple Choice

What are invasive species and why are they considered a threat to biodiversity?

• Non-native organisms that benefit ecosystems

• Native organisms that harm ecosystems

• Non-native organisms that harm ecosystems

• Native organisms that benefit ecosystems

Multiple Choice

What are the ways invasive species can enter an ecosystem?

• Accident

• Purpose

• Both

• None

Multiple Choice

The graph shows changes in carbon dioxide

(CO2) concentrations and surface temperatures

on Earth from the years 1880 to 2000.

Why do carbon dioxide concentrations and

surface temperatures show the relationship seen

in the graph?

• because lower carbon dioxide levels mean more

  heat is retained in Earth's atmosphere

• because higher carbon dioxide levels mean

  more heat is retained in Earth's atmosphere

• because lower carbon dioxide levels mean less

  heat is retained in Earth's atmosphere

• because higher carbon dioxide levels mean less

  heat is retained in Earth's atmosphere

Multiple Choice

Which species will rapid climate change be most likely to threaten?

• adaptable species

• recent species

• ocean living species

• endangered species

Multiple Choice

How can the introduction of an invasive species affect genetic diversity?

• It can increase genetic diversity by introducing new genes

• It generally has no effect on genetic diversity

• It can decrease genetic diversity by outcompeting native species for resources

• It can ensure the genetic purity of native species