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Chapter 54: Q54-5TYU (page 1235)

Predators that are keystone species can maintain species diversity in a community if they

(A) competitively exclude other predators.

(B) prey on the community鈥檚 dominant species.

(C) reduce the number of disruptions in the community.

(D) prey only on the least abundant species in the community.

Short Answer

Expert verified

  1. The statement 鈥渃ompetitively exclude other predators鈥� isfalse.

  2. The statement 鈥減rey on the community鈥檚 dominant species鈥� istrue.

  3. The statement 鈥渞educe the number of disruptions in the community鈥� is false.

  4. The statement 鈥減rey only on the least abundant species in the community鈥� is false.

Step by step solution

01

Predator

The species recognized as the keystone species and keeping the prey population in balance are called predators like gray wolves and beavers.

02

Explanation of option ‘(A)’

The varieties of roles performed by the predator in an ecosystem are maintaining ecosystem structure, decreasing competitive exclusion, and energy transfer at the trophic levels.

Thus, the species amount will be reduced by excluding predators by competition.

Therefore, the given statement is false.

03

Explanation of option ‘(B)’

The field of ecology defines prey as an animal that predators hunt or kill to eat all parts of its body as food.

Thus, the dominating species will be more and compete with other species.

Therefore, the given statement is true.

04

Explanation of option ‘(C)’

Some examples of biological disturbances are insect outbreaks, storms, trampling, and flooding.

Thus, there will be no effect of keystone species on the disruption in the community.

Therefore, the given statement is false.

05

Explanation of option ‘(D)’

Examples of predator-prey include fox-rabbit, bear-salmon, and lion-zebra.

Thus, biodiversity will not be increasing while preying on the least abundant species.

Therefore, the given statement is false.

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Most popular questions from this chapter

Food chains are sometimes short because

(A) only a single species of herbivore feeds on each plant species.

(B) local extinction of a species causes the extinction of the other species in its food chain.

(C) most of the energy in a trophic level is lost as energy passes to the next higher level.

(D) most producers are inedible.

Rabies, a viral disease in mammals, is not currently found in the British Isles. If you were in charge of disease control there, what practical approaches might you employ to keep the rabies virus from reaching these islands?

The principle of competitive exclusion states that

(A) two species cannot coexist in the same habitat.

(B) competition between two species always causes extinction or emigration of one species.

(C) two species that have exactly the same niche cannot coexist in a community.

(D) two species will stop reproducing until one species leaves the habitat.

The feeding relationships among the species in a community determine the community's

(A) secondary succession.

(B) ecological niche.

(C) species richness.

(D) trophic structure.

Describe two types of ecological interactions that appear to be occurring between the three species shown in this photo. What morphological adaptation can be seen in the species that is at the highest trophic level in this scene?
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