Matter and Energy in Organisms

An organism that makes its own food is known as

• consumer
• scavenger
• producer
• decomposer

What is an organism called that feeds on another organism?

• consumer

• scavenger

• producer

• decomposer

All matter is made of what

• energy

• atoms

• electrons

• compounds

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Molecules are 

• 2 atoms bound together 
• 2 elements bound together 
• 2 or more atoms mixed together
• 2 or more atoms bound together 

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Uses dead plants and animals for energy.

• worm
• grass
• rabbit
• none

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An organism that return matter from dead plants and animals back to the soil is called a ____________?

• carnivore

• decomposer

• herbivore

• omnivore

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Decomposers are important to ecosystems because they

• return vital nutrients to the ecosystem
• capture energy from the Sun
• are producers
• can be omnivores

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A consumer gets energy by

• absorbing sunlight.
• breaking down dead organisms.
• soaking it up from the ground.
• feeding on other organisms.

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The cycling of matter is important because

• Matter can be created and destroyed
• Only a limited amount of matter is available so it has to be recycled
• Matter can only be found in a solution
• Bacteria use matter to convert organisms into solar energy

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Plants, animals, and decomposers (which consume dead things) are in a forest ecosystem. Scientists are studying photosynthesis in the forest. Which group or groups of organisms should they study?

• all organisms in the forest

• animals and decomposers

• plants and decomposers

• plants

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