Interactions in Ecosystem

Competition in an ecosystem occurs when

• animals get bored.

• more than one individual or population in an ecosystem relies (needs) the same limited resource.

• there is more than enough of a resources for every living organism.

• resources are unlimited.

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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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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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When an organism depends on a factor for survival, this is called a ______________________ interaction.

• independent

• questionable

• dependent

• expendable

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Two different populations of birds live in the same area and eat the same types of food. Which most likely describes the relationship between these two populations of birds?

• competition

• mutualism

• parasitism

• predator-prey

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Two different populations of birds live in the same area and eat the same types of food. Which most likely describes the relationship between these two populations of birds?

• competition

• mutualism

• parasitism

• predator-prey

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A fig tree that provides shelter and fruit that are essential to the survival of numerous other species is an example of

• A keystone species

• An exotic species

• An indicator species

• An endemic species

A system made up of all the biotic and abiotic factors in an area and all the interactions among them.

• Ecosystem

• Niche

• Adaptation

• Nutrasystem

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Plants compete for air, water, ________ within ecosystems.

• space, and sound

• sunlight, and wind

• space, and sunlight

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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

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