Answers 24 - 25 CR - Biology B 0411KBBiogeographic Isolation-Standard Bio 4.5

Biogeographic Isolation-Standard Bio 4.5 — Unit test Answers

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Rhinoceroses are being poached at a rate of two or three a week in Africa and Asia. Which type of diversity is being lost as the population of rhinoceroses becomes very small?

species diversity

genetic diversity

ecosystem diversity

fragmented diversity

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Which factors involving the activities of people are a threat to biodiversity?

pollution and succession

habitat loss and predation

poaching and habitat loss

succession and poaching

Which of the following could result in the extinction of a species?

harsh restrictions on poachers

increase in the habitat size of a species

adding a new species to the habitat

decrease tourism in protected areas

Which bar graph best represents the provided data?Cause of extinctionPercentage of total extinctionsIntroduced species39Habitat loss36Hunting and poaching23Other 2

A bar graph titled Threats to Biodiversity shows cause of extinction on the horizontal axis and percent of total extinctions on the vertical axis. Introduced species, 39 percent; Hunting and poaching, 36 percent; Habitat loss, 23 percent; Other, 2 percent.

A bar graph titled Threats to Biodiversity shows cause of extinction on the horizontal axis and percent of total extinctions on the vertical axis. Introduced species, 40 percent; Hunting and poaching, 20 percent; Habitat loss, 40 percent; Other, 0 percent.

A bar graph titled Threats to Biodiversity shows cause of extinction on the horizontal axis and percent of total extinctions on the vertical axis. Introduced species, 39 percent; Hunting and poaching, 2 percent; Habitat loss, 36 percent; Other, 0 percent.

A bar graph titled Threats to Biodiversity shows cause of extinction on the horizontal axis and percent of total extinctions on the vertical axis. Introduced species, 39 percent; Hunting and poaching, 23 percent; Habitat loss, 36 percent; Other, 2 percent.

Which statement best describes ecological succession?

It is always caused by human intervention.

It occurs after a disturbance.

It never occurs in a predictable pattern.

It is a series of rapid changes in an ecosystem.

What is most likely to result immediately after a rainforest in Brazil is clear-cut?

secondary succession

primary succession

a climax community

increased biodiversity

Which is one event that may lead to Primary succession?

clear-cutting

climate change

volcanic eruption

introduced species

Which factor can cause secondary succession?

clear cutting

glacial melting

competition

predation

What is the role of a pioneer species in primary succession?

to destroy parasites

to provide shade

to provide fruit

to produce the soil

On May 18, 1980, Mount St. Helens in Washington State experienced a huge volcanic eruption after a magnitude 5.1 earthquake. During the eruption, hot ash and pumice poured down the west, south, and east sides of the mountain, melting the snow and ice at the top of the volcano and producing volcanic mudflows. Which type of process first occurred in the ecosystem around Mount St. Helens after it erupted?

primary succession

secondary succession

a climax community

species extinction

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Biogeographic Isolation-Standard Bio 4.5 — Unit test Answers

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