BIO 8B Ecology: Cycles of Matter

What is one of the most important processes that removes carbon from the atmosphere? 

• photosynthesis
• cellular respiration
• erosin
• soil respiration

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Where do animals get nitrogen from?

• soil
• air
• water
• plants

Matter on Earth is limited, so it must be used ____________________________.

• only once
• over and over again
• by only animals
• at night only

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What role do animals play in the carbon cycle?

• absorb carbon dioxide from the atmosphere
• give off carbon dioxide
• combustion
• decomposing matter

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All living parts of an ecosystem (plants, animals, and decomposers) are depend on one another for

• food

• energy

• cycling matter

• food, energy, and the cycling of matter

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Photosysnthesis and respiration are important because

• they make mutualism possible

• they are the building blocks of life

• they are the 6 characteristics of life

• they cycle matter and energy between autotrophs and heterotrophs

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______ fix nitrogen into a usable form for plants.

• Carbon

• Bacteria

• Consumers

• Animals

When ______ occurs, molecules at the surface of liquid water absorb energy to change to a gas.

• Precipitation

• Evaporation

• Transpiration

• Condensation

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Why are the nitrogen, carbon, and water cycles described as “cycles”?

• They have a beginning and an end.

• They are continuous processes that have no beginning or end.

• Their processes form circles.

• Like a food chain, they are one-way.

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This cycle is important to understand in ecology because its element makes up a majority of organisms (living things).

• Nitrogen cycle

• Water cycle

• Carbon cycle

• Rock cycle

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