Nutrient Cycles in the Ecosystem

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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Animals and plants use substances that cycle through the environment. Which substance is needed by plants to survive and is released into the environment by animals?

• Oxygen

• Sugar

• Salt

• Carbon Dioxide

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Complete the diagram using the options below.

a

b

c

d

e

f

Cellular Respiration

Fossil Fuels

Carbon in the Atmosphere

Combustion

Decomposition

Photosynthesis

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Match the following to reflect organisms' roles in the nitrogen cycle:

• Nitrogen-fixing Bacteria

• Absorb nitrogen from the soil to create proteins.

• Animals

• Found in soil, they "fix" nitrogen into a form plants can use.

• Lighting

• Naturally "fixes" nitrogen from the atmosphere through a chemical reaction.

• Plants

• Break down waste and dead material, returning nutrients to soil.

• Decomposers

• Consume plants or other animals, then deposit waste that is recycled.

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If sunlight and water are ample supply, primary productivity may be limited by the availability of _______________.

• Nutrients

• Oxygen

• Carbon Dioxide

• Temperature

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Freshwater → _______________ is limiting.

• Phosphorus

• Nitrogen

• Carbon

• Oxygen

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Ecosystems can be delicate. Our nutrient cycles are changing because of...

• human activity

• lack of water

• excess sunlight

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a biological community of interacting organisms and their physical environment

• ecosystem

• individual organism

• community

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The Carbon Cycle shows...

• the movement of carbon on earth and how carbon enters the food chain

• the movement of oxygen on earth and it enters the food chain

• the movement of water on earth and how hydrogen enters the food chain

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The Carbon Cycle involves the process of ...

• biotic factors and abiotic factors

• photosynthesis and cellular respiration

• autotrophs and heterotrophs

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