Environmental Science - Unit 5 - How Ecosystems Work

Which terms best describe heterotrophs?

• Plants; producers
• Animals; producers
• Plants; consumers
• Animals; consumers

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Which terms best describe autotrophs?

• Plants; producers
• Animals; producers
• Plants; consumers
• Animals; consumers

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From where do autotrophs obtain their energy?

• The sun
• Other organisms

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Organisms that cannot make their own food and must obtain energy from external sources are called

• autotrophs
• heterotrophs
• thylakoids
• plants

What is an autotroph?

• an organism that can make their own food. 
• an organism that cannot make their own food
• Herbivore
• Omnivore

The efficiency of energy transfer from a lower trophic level to the next highest level is roughly

• 1%
• 10%
• 100%
• 1000%

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Trophic levels are represented by 

• squares
• circles
• pyramids
• lines

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The arrows in a food chain or web represents what?

• They point to the organism that is being eaten.
• It shows how sunlight flows within an ecosystem.
• They show what direction the energy is flowing between organisms. 
• They represent how water is transferred within a habitat.

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An organism that gets energy from breaking down dead organisms, non-living material or waste is a(an) ___________.

• producer
• consumer
• decomposer
• autotroph

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Organisms that create their own energy from sunlight or chemicals

• Herbivore
• Omnivore
• Autotroph
• Heterotroph 

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