Matter cycles

What is our role in the carbon cycle? 

• We are made of carbon. 
• We release it into the atmosphere when we breathe. 
• We release it into the atmosphere when using fossil fuels. 
• All of the above. 

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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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Why is nitrogen important to organisms?

• All plants and animals need nitrogen to make amino acids, proteins and DNA.
• All plants and animals need nitrogen to make fatty acids and carbohydrates. 
• All plants and animals need nitrogen to make sugar.
• None of the above. 

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Carbon is found in the atmosphere in the form of 

• carbohydrates
• carbon dioxide
• calcium carbonate
• ammonia

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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The only organisms that can convert nitrogen in the atmosphere into a form useful to living things are nitrogen-fixing

• plants

• bacteria

• insects

• animals

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Where is carbon found? 

• Atmosphere
• Soil
• Us
• All of the above

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Which cycle is this?

• Carbon
• Nitrogen
• Phosphorus
• Water

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The mechanism that producers use to obtain energy from sunlight is

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Living organisms obtain energy from glucose through:

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