Abiotic Cycles

When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide.

• Water
• Atmosphere
• Sun
• Air

What does not produce carbon dioxide?

• Photosynthesis
• Burning Fossil Fuels
• Animal respiration
• Plants decaying

The circulation of the element Carbon among Earth's atmosphere, land, oceans, and organisms is called _____________.

• the Carbon Cycle

• the Oxygen Cycle

• the Carbon dioxide Cycle

• the Water Cycle

If the plant population decreased, the amount of carbon in the atmosphere would ____________________.

• Increase

• Decrease

• Stay the same

What role do animals play in the carbon cycle?

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

Within the carbon cycle, anything that releases more carbon into the atmosphere than it absorbs.

• carbon sink

• carbon source

SC.912.L.17.9

   Producers and consumers have a relationship with in the carbon cycles.  Which statement is the best example of how carbon moves through a food chain as part of the carbon cycle?

• A. Producers release carbon dioxide, and consumers take it in.

• B. Producers take in carbon dioxide, and consumers release it.

• C. Producers take in carbon from the soil, and they release it when they decompose.

• D. Producers release carbon into the soil, and consumers take it in from the soil.

The process in which nitrogen circulates and is recycled is called

• The nitrogen cycle

• The carbon cycle

• The water cycle

• The phosphorus cycle

Organisms that need nitrogen to survive.

• only plants

• only animals

• only bacteria

• all living things

How is nitrogen "fixed" into a usable form for plants?

• Through action of bacteria only

• Through lightning only

• Through action of bacteria and lightning

• Through photosynthesis