Matter and Energy in Ecosystems

Front

Bob grows vegetables in the same soil year after year. The plants produce fewer vegetables each year. Which of these processes could help explain Bob's observation?

Back

the rate at which soil bacteria perform nitrogen fixation

Front

What are the organisms called that obtain energy from inorganic sources like the sun or other chemicals to form energy-rich compounds?

Back

Producers

Front

Where do most producers get their source of energy from?

Back

sun

Front

Model of food relationships in an ecosystem: Which statement is true?

Back

There is a food web and several overlapping food chains

Front

What type of ecological models are the carbon cycle, nitrogen cycle, and water cycle?

Back

biogeochemical cycles

Front

What converts nitrates back into nitrogen gas in the atmosphere?

Back

denitrification

Front

Which statement describes all primary producers?

Back

Most harness energy from sunlight through the process of photosynthesis.

Front

Energy flows from primary producers to consumers in one direction only.

Back

True

Front

How much energy is transferred from one trophic level to the next?

Back

10%

Front

In a biomass pyramid in an ecosystem, does the amount of biomass increase as you go up the pyramid?

Back

False