Unit 3: Sec 1 Quiz

What is the definition of a population in an ecosystem?

• A group of organisms of different species living in the same area

• A group of organisms of different species living in different areas

• A group of organisms of the same species living in different areas

• A group of organisms of the same species living in the same area

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

• It has no significant impact on the structure of the community

• It is the most abundant species in the ecosystem

• It has a critical role maintaining the structure of the community

• It only interacts with abiotic factors in the ecosystem

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What is the carrying capacity of an ecosystem?

• The smallest number of individuals in a population that an ecosystem can support

• The greatest number of individuals in a population that an ecosystem can support

• The average number of individuals in a population that an ecosystem can support

• The number of different species in an ecosystem

What is a trophic cascade in an ecosystem?

• When something happens that affects the organisms from one trophic level, other trophic levels are impacted as well

• When the population of a keystone species decreases, it only affects the population of the same species

• When the population of a keystone species decreases, it has no impact on other trophic levels

• When the population of a keystone species increases, it has no impact on other trophic levels

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What is the main reason for the extinction of a species in an ecosystem?

• The needs of the species are no longer met in the environment

• The changes in biotic factors in the environment

• The changes in abiotic factors in the environment

• The availability of energy in the ecosystem

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What is the impact of wolves on the elk population in Yellowstone National Park?

• Wolves increase the elk population and make it healthier

• Wolves reduce the elk population and only the strong elk survive

• Wolves have no interaction with the elk population

• Wolves have no impact on the elk population

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What are the consequences of wolf introduction that have been good for the humans in the Yellowstone National Park area?

• The water source became dirtier for the people living near the park

• The water source became cleaner for the people living near the park

• The elk population increased and caused overgrazing

• The elk population decreased and caused less overgrazing

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2. What affect does the growth of a prey population have on a predator population in an ecosystem?

• The predator population will also increase
• The producer population will decrease
• Other populations in the ecosystem will be impacted
• All of the above

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1. Carrying capacity is...

• a failing ecosystem
• resources
• greatest number of individuals in a population that an ecosystem can support
• All the squirrels in a forest

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3. What factors impact populations?

• Biotic factors only
• Abiotic factors only
• Both abiotic and biotic factors

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