hat are 'keystone' species in an ecosystem?Answer choicesSelect only one optionREVISITThe species whose elimination can seriously affect the ecosystem.The species whose elimination can benefit the ecosystem.The species whose elimination would not affect the ecosystem.None of the above

Which of the following is the most accurate description of the impact of a keystone species on the surrounding ecosystem?ResponsesA keystone species is a top predator that occupies a large territory and consumes a wide variety of primary consumers in its ecosystemA keystone species is a top predator that occupies a large territory and consumes a wide variety of primary consumers in its ecosystemThe removal of a keystone species would result in increased resource availability for other species in the ecosystemThe removal of a keystone species would result in increased resource availability for other species in the ecosystemThe removal of a keystone species would destabilize the ecosystem in its absenceThe removal of a keystone species would destabilize the ecosystem in its absenceThe addition of a keystone species to an ecosystem would generate more ecological niches for other species to occupy

Which of the following statements correctly describes the full value of a keystone species on its ecological community?Choose 1 answer:Choose 1 answer:(Choice A)   They are non-native organisms that can damage the ecosystem, so removing them increases biodiversity.AThey are non-native organisms that can damage the ecosystem, so removing them increases biodiversity.(Choice B)   They are superior predators that displace inferior competitors.BThey are superior predators that displace inferior competitors.(Choice C)   They are the largest species in a community and consume more than the others, keeping other populations in check.CThey are the largest species in a community and consume more than the others, keeping other populations in check.(Choice D)   They have a disproportionate effect relative to their frequency in the population, so the ecosystem often collapses when they are removed.DThey have a disproportionate effect relative to their frequency in the population, so the ecosystem often collapses when they are removed.

What is a keystone species, why are they important to the ecosystem?*

What happens to a food web if the keystone species is removed?Group of answer choicesThe food web simplifies and there is lower biodiversity.The food web simplifies and there is higher biodiversity.The food web becomes more complex and there is lower biodiversity.The food web becomes more complex and there is higher biodiversity.

A keystone species is a species whose presenceMultiple Choiceis the main reason a community exists.provides food for all other species in a community.is an indicator of environmental health.influences the population size of many other species in its community.