The principles of ecology

Ecology is

• the study of how living things interact with each other.

• the study of how living things interact with their environment.

• the study of how living things interact with each other and with their environment.

• he study of how living things and their niche.

Examples of abiotic factors include

• trees, soil, and sunlight.

• sunlight, soil, and water.

• the living aspects of the environment.

• all of the above.

Which of the following mainly determine a habitat’s features?

• temperature and rainfall.

• animals in the habitat

• plants and animals

• soil and water

Energy enters most ecosystems in the form of

• soil and water.

• food.

• water.

• sunlight.

Examples of producers include

• plants, algae, and cyanobacteria.

• plants and photosynthetic insects.

• lions, bears, and eagles.

• mice, rabbits, and deer.

Which statement best explains the relationship between decomposers and producers?

• Decomposers use the molecules that producers release back to the environment.

• Producers use the molecules that decomposers extract from the environment.

• Producers use the molecules that decomposers release back to the environment.

• Decomposers use the molecules that producers extract from the environment.

Which statement best explains the relationship between a food chain and a food web?

• A food web includes many intersecting food chains.

• A food chain includes many intersecting food webs.

• A food chain leads into a food web.

• A food web and food chain begin and end with the same organisms.

Which organism would occupy the fourth trophic level?

• phytoplankton

• sea duck

• tundra swan

• bald eagle

Approximately how much energy is passed between trophic levels?

• 1%

• 10%

• 25%

• 50%

Which group of organisms would have the greatest biomass?

• All the producers in an ecosystem.

• The largest organisms in an ecosystem, such as elephants.

• The trillions of insects in an ecosystem.

• all of the above