Matter Cycles

Water that falls from clouds to the ground in the form of rain, sleet, hail, or snow

• condensation

• evaporation

• precipitation

• runoff

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Water evaporates from the leaves of a plant and returns to the atmosphere in a process called

• transpiration

• respiration

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How do animals get nitrogen that is stored in the soil?

• They are unable to

• Bacteria change the nitrogen into a gas that the animals can breath

• Plants absorb the nitrogen from the soil and animals can eat the plants

• Animals can eat the soil and absorb the nitrogen through their digestive system

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Where does the energy from the water cycle come from?

• Fossil fuels

• Sun

• The spin of the Earth

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What is the main process by which water moves from land to the atmosphere?

• Evaporation

• Condensation

• Precipitation

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Why is carbon such an important element?

• Carbon is a central element to all organisms.

• Without carbon, the sun would run out of energy.

• It's an input of cellular respiration.

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Which part of the carbon cycle occurs when plants or animals die?

• Respiration

• Decomposition (Decay)

• Combustion

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Which process puts extra nitrogen in the soil back into the air (atmosphere)?

• Nitrogen fixation

• Nitrification

• Denitrification

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How plants and animals get nitrogen?

• Most plants get the nitrogen they need to grow from the soils or water in which they live.
• Animals get the nitrogen they need by eating plants or other animals that contain nitrogen. 
• Bacteria alter the nitrogen into a form that plants are able to use.
• All of the above.

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Biologists describe nutrients as moving through cycles because the substances

• start as simple organic forms that plants need. 
• provide “building blocks” and energy that organisms need.         
• are passed between organisms and the environment and then back to organisms.       
• are needed by organisms to carry out life processes.

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