Species at Risk and Extinction
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Questions and Answers

What is the primary consequence of two species occupying the same ecological niche in the same place at the same time?

  • Formation of a new species through hybridization
  • Immediate extinction of one of the species
  • One species evolves into a slightly different niche (correct)
  • Coexistence of the species without any adaptations

    • Which type of symbiotic relationship involves one organism benefiting while the other is not affected?

  • Predation
  • Mutualism
  • Parasitism
  • Commensalism (correct)

    • What is the term for the process by which a species evolves to occupy a slightly different niche in order to coexist with another species?

  • Habitat formation
  • Species divergence
  • Ecological adaptation
  • Niche specialization (correct)

    • What is the term for the interaction between two organisms where one hunts and the other is attacked?

    <p>Predation</p> Signup and view all the answers

    What is the term for the unique role that a species plays in its ecosystem, which has a disproportionate impact on the environment and other species?

    <p>Keystone species</p> Signup and view all the answers

    What is the primary reason for the sudden extinction of a species in a habitat?

    <p>Toxic pollution rendering the habitat unlivable</p> Signup and view all the answers

    What is a characteristic of mutualism in many cases?

    <p>Both species are Obligate and can exist without the other</p> Signup and view all the answers

    What is the result of coevolution between grazing animals and grass species?

    <p>Development of new ecological interactions</p> Signup and view all the answers

    What is the term for the complex interrelationships between a community and the physical environment?

    <p>Ecosystem</p> Signup and view all the answers

    What is a key characteristic of a keystone species?

    <p>Ecological interactions with multiple species</p> Signup and view all the answers

    Which type of consumer eats both plants and animals?

    <p>Omnivores</p> Signup and view all the answers

    What is the primary benefit of predation for the predator?

    <p>Receipt of food and energy</p> Signup and view all the answers

    What is the term for the step in the flow of energy through an ecosystem?

    <p>Trophic level</p> Signup and view all the answers

    What is the result of a species' gradual loss of competition for food?

    <p>Gradual extinction of the species</p> Signup and view all the answers

    What is the term for the assemblage of all interacting species of organisms in an area?

    <p>Community</p> Signup and view all the answers

    What is the primary reason for the excess number of individuals in a species, resulting in a shortage of specific resources?

    <p>Production of more offspring than needed to replace the parents</p> Signup and view all the answers

    What is the outcome of a species dividing into two isolated subpopulations?

    <p>Speciation, resulting in two new species</p> Signup and view all the answers

    What is the estimated percentage of species that have gone extinct on Earth?

    <p>98-99%</p> Signup and view all the answers

    What is the term for the concept that two or more species can reciprocally influence the evolutionary direction of the other?

    <p>Coevolution</p> Signup and view all the answers

    What is the result of natural selection acting on a species over time?

    <p>The elimination of unfavorable variations</p> Signup and view all the answers

    What is the primary role of a keystone species in an ecosystem?

    <p>To maintain the diversity of the ecosystem</p> Signup and view all the answers

    What is the term for the total of all the ways an organism affects its environment and interacts with other organisms?

    <p>The total interaction</p> Signup and view all the answers

    What is the difference between a population and a species?

    <p>A population is a group of individuals found within a specific geographic region, while a species is a group of populations that can interbreed</p> Signup and view all the answers

    What is the process that determines which individuals within a species will reproduce and pass their genes to the next generation?

    <p>Natural selection</p> Signup and view all the answers

    What is the term for the specific role and position that an organism occupies within its environment?

    <p>Ecological niche</p> Signup and view all the answers

    What percentage of energy is lost as heat when moving from one trophic level to the next?

    <p>90%</p> Signup and view all the answers

    What is used as a proxy to measure energy contained in each trophic level?

    <p>Biomass</p> Signup and view all the answers

    What is the term for a series of organisms occupying different trophic levels through which energy passes?

    <p>Food chain</p> Signup and view all the answers

    What is the primary function of an organism's habitat?

    <p>To influence the organism's interaction with its surroundings</p> Signup and view all the answers

    What is a characteristic of a food web?

    <p>A single predator has multiple prey species</p> Signup and view all the answers

    What is the characteristic of an organism that has a narrow range of tolerance?

    <p>It is more susceptible to limiting factors</p> Signup and view all the answers

    What is the byproduct of photosynthesis in plants?

    <p>Oxygen</p> Signup and view all the answers

    What is the process by which decomposers recycle naturally occurring organic molecules?

    <p>Decay</p> Signup and view all the answers

    What is the term for the nonliving things that influence an organism?

    <p>Abiotic factors</p> Signup and view all the answers

    What is the functional role of an organism in its surroundings?

    <p>Niche</p> Signup and view all the answers

    What is the final stage of the carbon cycle in which CO2 and water are released back into the atmosphere?

    <p>Respiration</p> Signup and view all the answers

    What is the primary factor that restricts species success?

    <p>Limiting factors</p> Signup and view all the answers

    What is the term for the cycling of molecules and atoms between living and non-living portions of an ecosystem?

    <p>Biogeochemical cycles</p> Signup and view all the answers

    What is the primary mechanism by which energy is transferred from one trophic level to the next?

    <p>Consumption</p> Signup and view all the answers

    What is the term for the series of processes by which carbon is exchanged between the atmosphere and living organisms?

    <p>Carbon cycle</p> Signup and view all the answers

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