Answers Environmental Science 1 SS26 CR – 090-030023R-T1-AM-EDG-1Succession and Extinction

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How does a whale fall community affect ocean sediment?

The decomposition of the whale enriches the sediment.

The remains of the whale pollute the sediment.

The sediment is transformed into food for mussels and crabs.

The bacteria that are attracted break down the sediment nearby.

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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

The diagram below shows the stages of succession in a forest ecosystem. Which area shows the climax community of secondary succession?

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.

Why are lichens a good pioneer species after a volcanic eruption?

They are able to grow on moist soil.

They are able to grow on bare rock.

They are able to attract animals.

They are able to grow without water.

Why are lichens a good pioneer species after a volcanic eruption?

They are able to grow on moist soil.

They are able to grow on bare rock.

They are able to attract animals.

They are able to grow without water.

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.

According to the pie chart, which cause results in the most extinctions?

other

introduced species

habitat loss

hunting and poaching

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

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

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.

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

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, 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.

The diagram below shows the stages of succession in a forest ecosystem. Which area shows the climax community of secondary succession?

Which is one event that may lead to Primary succession?

clear-cutting

climate change

volcanic eruption

introduced species

Which disturbance would result in primary succession?

harvesting wheat by using a combine harvester at the end of the growing season

controlled burning to stimulate the growth of forest trees such as sequoia

the formation of Surtsey, a volcanic island off of the southern coast of Iceland

the effect of a large herd of elephants on the grasses and shrubs in an area

Which factor can cause secondary succession?

clear cutting

glacial melting

competition

predation

The number of rhinoceroses has decreased to near extinction. How are rhinoceroses classified under the Endangered Species Act?

endangered

threatened

extinct

pioneer

In one species of bird, there are three varieties of feather color. What is this an example of?

ecosystem diversity

species diversity

genetic diversity

color diversity

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

to destroy parasites

to provide shade

to provide fruit

to produce the soil