Interactions and Competition

Living things depend on many different _________ in order to survive.

• resources
• environments
• ecosystems
• interactions

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An invasive species is a plant or animal that is ________ to an ecosystem.

• not native
• just visiting
• beneficial
• not friendly

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Hawks and owls eat the same type of food and struggle with one another to get their food. What is this an example of?

• Competition

• Biotic factor

• Symbiosis

• Population

The specific environment in which all the biotic and abiotic factors in an area interact.

• Ecosystem

• Organism

• Struggle

• Competitive Interaction

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Hawks and brown bears live together in the same habitat. There will be competition between the hawks and the brown bears only if which of the following is true?

• Brown bears hibernate during the winter while hawks remain active.

• Pesticides in the fish population affect hawks’ eggs and decrease their population.

• Both brown bears and hawks feed on the same species of fish.

• Both Shanna and Savanna feed on the same species of snakes.

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Competition becomes more important as the number of individuals ______ or the availability of resources _________.

• increases, decreases

• increases, increases

• decreases, increases

• decreases, decreases

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The milkweed plant serves an important role in the life cycle of the monarch butterfly. Adult monarchs lay their eggs on milkweed, and then caterpillars eat that same plant during their development. Based on the relationship between monarchs and milkweed, which of the following trends would be predicted when looking at data on the populations of these two organisms?

• A decrease in the milkweed population will cause a decrease in the monarch butterfly population.

• When the milkweed population decreases, the monarch butterfly population stays the same.

• A decrease in the milkweed population will cause the monarch population to increase.

• When the monarch population increases, the milkweed population stays the same.

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In an ecosystem, what do organisms and populations with similar needs compete over?

• food

• water

• shelter

• all of the above

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Organism X feeds mainly on small fish, amphibians, and reptiles. With which organism is organism X most likely to compete?

• Great blue heron

• Mallard

• Pied-billed grebe

• Great egret

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What will happen if a factor that a species is dependent on decreases?

• The species will also decrease

• The species will increase

• nothing

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