Ecology Unit Review

The diagram above represents relationships in an

ecosystem. What is the primary source of energy in

this environment?

• cellular respiration in the plants

• energy from minerals in the soil

• fossil fuels

• solar energy

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What is one of the best ways to represent the

interdependence of all of the organisms in an

ecosystem?

• a cell model

• a food chain

• a diagram of the water cycle

• a food web

Many oak trees are cut down and removed from an

oak-hickory forest. A likely result of the direct

harvesting of the oak species would be the

• disruption of natural cycles

• conservation of these natural forest resources

• recycling of all the nutrients in the forest

• prevention of the extinction of animals native to

  the area

Which human activity most directly causes a

significant increase in the amount of carbon dioxide

in the atmosphere?

• growing corn for food

• not using products containing plastics

• driving cars long distances

• planting large numbers of trees

The amount of energy that usually transfers from one trophic level to the next...

• 10%
• 20%
• 80%
• 50%

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. 

symbiotic relationship in which both organisms benefit

• competition
• Mutualism
• nitrogen fixation
• energy pyramid

A collection of organisms that belong to different populations but all live in the same area and interact with one another.

• Population
• Ecosystem
• Community
• Ecosphere

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

• Population
• Community
• Habitat
• Ecosystem

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The living portions of the ecosystem.

• Biotic factors
• Abiotic factors

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