ESS 3.3 threats to biodiversity

During which century did the Dodo become extinct?

• 16th

• 17th

• 18th

• 19th

Choose which of the following pairs of criteria would be taken into account when determining the conservation status of a species:

• Population size and position in the food chain

• Specialisation of a species and the number of scientific publications on the species’ population.

• Geographic range of a species and the extent of the use of a species’ image in the media.

• Quality of a species habitat and the range of monetary funds set up to protect that species.

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What does IUCN stand for?

(a)  

The aim of IUCN are.............

• to evaluate whether a species is under threat

• to provide information and analysis on the status of species

• to see the trends and threats to species in order to conserve them

• raise some fund

species that are employed as symbols by conservationist organisation to raise awareness of a particular environmental problem called

• keystone species

• flagship species

• native species

• umbrella species

The document produced by the IUCN that catalogues all endangered species is called (a)  

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The dodo is an example of a large flightless bird that has become extinct. What was the reason for its extinction?

• It was hunted by humans for meat.

• It was a poor competitor, unable to respond well to predation.

• Loss of forest habitat.

• All three reasons contributed to the extinction of the dodo.

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All species have a natural extinction rate, which is referred to as the background extinction rate. What is the approximate value of this rate (how many species go extinct per year) ?

• 1 - 100 species per year

• 100 - 1,000 species per year

• 1,000 - 10,000 species per year

• It is impossible to estimate the rate because of the lack of reliable data.

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Does a large body make an animal more vulnerable to extinction?

• Yes, because large mammals are of more economic value to humans and therefore more vulnerable to poaching.

• Yes, because the inefficiency of energy transfers along the food chain makes large animals rare.

• No, body size does not influence an organism’s vulnerability to extinction.

• No, a large body makes animals less prone to extinction.

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The Giant panda is an example of a habitat specialist. What does this term signify?

• It is a top predator in its habitat.

• It is a species that occurs only in one place in the world.

• It is a species that has specific dietary requirements.

• It is a species that is very-well suited to its environment and therefore not prone to extinction.

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