Energy and Interactions in Ecosystems

What is the original source of almost all energy in most ecosystems?

• carbohydrates
• sunlight
• water
• carbon

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What is the term for each step between niches in the transfer of energy and biomass within a biological community?

• energy path
• food web
• trophic level
• food pyramid

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What does a food web represent?

• All connections of energy flow throughout all organisms in a habitat.
• The specific ways that mutualism is carried out.
• A single pathway or energy flow between organisms. 
• How carnivores get their food. 

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A collection of organisms that make up a community as well as all of the nonliving aspects of the environment.

• Population
• Community
• Habitat
• Ecosystem/Biome

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Organisms that can capture energy from inorganic, nonliving sources such as geothermal energy or sunlight.

• Producers
• Consumers
• Detritivores
• Carnivores

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The general name for organisms like animals and fungi that get their energy from eating other organisms.

• Producers
• Consumers
• Detritivores
• Carnivores

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An organism at the second trophic level (primary consumer) can also be called a...

• Top carnivore
• Producer
• Herbivore
• Carnivore

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A graphic illustration that shows each trophic level and the amount of useable energy contained within.

• Food chain
• Food web
• Energy Pyramid
• All of these

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If a disease destroying many of the barley plants in a field swept through an ecosystem, what would happen to the barley eating bird population in the the field ?

• The bird population would stay the same
• The bird population would infinitely increase
• The bird population would decrease until extinct
• The bird population would decrease until the barley population rebounded and then would increase again.

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The birds that eat barley are preyed on by hawks. If hawks were removed from this ecosystem, what is the most likely result?

• The bird population would stay the same
• The bird population would increase until its resources (barley) are depleted and then decrease to its "carrying capacity"
• The bird population would decrease until extinct
• The birds would become apex predators

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