Introduced or exotic species like the zebra mussel often explode in numbers, rea

Question

Introduced or exotic species like the zebra mussel often explode in numbers, reaching densities in their new homes far greater than they ever did in their original range. This is most likely because

A) chemical and physical conditions in the new home are more favorable for growth and reproduction.

B) food and other resources are more plentiful in the new home.

C) the highly mobile colonists that reach the new home are usually genetically superior to the sedentary individuals that stay behind.

D) the competitors, predators, and parasites with which they evolved and which normally keep them in check are not present in the new home.

E) all of these

Which of the following is NOT an example of a human activity that directly threatens the biodiversity of species?

Which of the following is NOT a concern with the introduction of an exotic species into a non-native ecosystem?

A) displacement of native species

B) rapid spread of the exotic species from the introduction area to other areas

C) alteration of the ecosystem

D) alteration of the climate

E) predation on native species by the exotic species

There is an article in your local newspaper about an upcoming "Biodiversity Day" event at your university. Because you understand why it's important to conserve biodiversity after studying biology, you plan to attend. Your younger brother tells you he doesn't understand how the loss of a few species or habitats in town can have any impact on anyone's life. You could tell him

A) a decrease in biodiversity could result in a loss of species that could provide humans with new drugs to cure disease.

B) directly or indirectly, humans rely on the functioning ecosystem.

C) the loss of even one species may cause the collapse of important systems that humans rely on.

D) all of the above are reasons to protect biodiversity.

Explanation / Answer

1. (d)

Exotic species are successful in their new ecosystem because their new environment do not have any natural Predator of pest so they can reproduce and grow rapidly.

2. (e) they all are important because destruction of habitat cause extinction of many species. Invasion of new species become Predator to some species, over exploitation of resources means declining in food production, burning of fossil fuels is a kind of loss of habitat of many species.

3.(D) alteration of climate, invasive species never affect the climatic condition .

4.(D) all reasons are important to protect biodiversity

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