Chapter 5- Life Science

Which defines extinction?

• A species disappears.

• An ecosystem vanishes.

• Biodiversity decreases.

• Genetic diversity crops.

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Which defines background extinction?

• an accelerated extinction rate

• extinctions of unknown species

• mass extinctions in the past

• the natural extinction rate

Which is an example of habitat fragmentation?

• building several roads through wetlands

• cutting down an entire section of forest

• dumping chemical pollutants into a lake

• removing the predators from a rainforest

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Extinction describes the disappearance of a(n) ____

• organism from an ecosystem.

• organism from the biosphere.

• species from an ecosystem.

• species from the biosphere.

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Which is an indirect economic value of a mangrove forest growing along a coast?

• flood protection

• fruit harvesting

• lumber source

• tourist destination

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Which group has suffered the greatest percentage of species extinctions since 1600?

• birds

• fishes

• mammals

• reptiles

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The increased concentration of pesticides in the tissues of organisms that are high on the food chain is an example of _______

• biodiversity.

• biological augmentation.

• biological magnification.

• bioremediation.

Which is an example of genetic diversity within a rainforest?

• all of the genes found within the ecosystem

• DNA of a single three-toed sloth

• many variations of jaguar spots

• wide variety of beetle species

Which is an example of the aesthetic value of a healthy ecosystem?

• a beautiful waterfall

• a wide variety of genes

• excess oxygen

• fertile topsoil

Which causes acid precipitation?

• acetic acid

• citric acid

• hydrochloric acid

• sulfuric acid