1) In a typical ecosystem, a species whose removal would : 1380998

1) In a typical ecosystem, a species whose removal would : 1380998.


1) In a typical ecosystem, a species whose removal would have a bigger impact than any other would be a/an:

A) community species.

B) ecological dominants.

C) dominant species.

D) keystone species.


2) A small number of species that are abundant in a given community are called:

A) community species.

B) ecological dominants.

C) dominant species.

D) keystone species.


3) Keystone species are:

A) always at the top of the food chain.

B) always the most numerous.

C) never at the top of the food chain.

D) might be of any number, anywhere on the food chain.


4) An accidental spill of a pesticide locally wiped out the most abundant species of butterfly in coastal California. Most of the bird species in the area had fed on this butterfly, but they switched prey to moths, and thus the birds showed only a small decrease in population size. The butterflies were a/an:

A) keystone species, and thus they were driven to extinction very easily.

B) endangered species.

C) ecological dominant, but they were not a keystone species.

D) pioneer species.


5) Biodiversity includes the:

A) genetic diversity within only the keystone species.

B) distribution of species in only one population.

C) diversity of species in a given area.

D) number of individuals in a population.

6) On a hike along the desert slope of the Sierra Nevada Mountains in California, you notice that there is an abundance of pinyon pine and juniper trees. We would identify these two plants as:

A) competitors.

B) mutualistic species.

C) ecological dominants.

D) symbiotic species.


7) The coral organisms on a coral reef cannot be replaced by any other organism. For that reason, we identify those species as:

A) ecological dominants.

B) keystone species.

C) mutualistic species.

D) symbiotic species.


8) Choose the characteristic associated with a top predator who is also a keystone species.

A) the largest animal in the community

B) the fastest animal in the community

C) a species that can easily cause extinction of the community

D) a species whose loss may alter diversity within the community


9) A botanist has found that the giant saguaro, Carnegiea gigantea, lives in the Sonoran Desert below the freeze line and in some very dry regions (such as Yuma) to the eastern edge of Arizona. She has described the ________ of saguaro.

A) resource spectrum

B) vital resource

C) resource band

D) habitat


10) The “address” where a species lives within a certain area is identified as its:

A) ecosystem.

B) habitat.

C) community.

D) population.





1) In a typical ecosystem, a species whose removal would : 1380998

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