Organisms Interactions in Ecosystems

Ecosystem

• Not living or produced by living things

• Living or produced by living things

• A group of interacting individuals of the same species located in the same area

• How all of the living and nonliving things in an area interact

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Vocabulary:

Environmental Interactions

• A single, self-contained living thing

• Relationships between an organism or population and abiotic factors

• Not living or produced by living things

• Multiple systems working together to accomplish various tasks

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What could be the cause of a decrease in the population of bass (fish)?

• An increase in the snail population

• An increase in the sunfish population

• An increase in the minnow population

• An increase in the snapper turtle population

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What abiotic factors influence the relationships of organisms in ecosystems?

• Sunlight, weather, and human interaction

• Sunlight, rainfall, and invasive species

• Sunlight, weather, and soil composition

• Sunlight, rainfall, and plant growth

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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

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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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Pest populations that damage plants

• breed more slowly in hot climates.

• become resistant to pesticides via natural selection.

• include only insects and small rodents.

• attack wild plants with greater success than crops.

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What would happen if the zebra population declined due to a disease?

• There would be more competition among the lions, hyenas, and cheetahs

• The grass population would decrease

• The giraffe population would decrease

• Baboons would have a food shortage

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Which is NOT a biotic factor that influences the relationships of organisms in ecosystems?

• Disease caused by bacteria

• Weather

• Competition among predators

• Invasive species