Biogeochemical Cycles

What does not produce carbon dioxide?

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

How do decomposers benefit the carbon cycle?

• Dead organic matter is broken down and nitrogen is released into the air
• Decaying organisms are essential for carbon to be released back into the food web
• Carbon is leaked into the air when fossil fuels are burned
• Volcanoes and fires ven large amounts of carbon dioxide into the sky

Which of these best describes the interaction of living things with the land?

• Organisms depend of soil, but the development of soil does not depend on organisms
• Plants and animals that live and die in soil return nutrients to the soil
• Living organisms do not play an essential role in the development of fertile soil
• Plant roots are not strong enough to weather rock they encounter while growing.

How do living organisms return carbon to the atmosphere in the carbon cycle?

• nitrogen fixation and combustion
• respiration and photosynthesis
• death/decomposition and respiration
• nitrogen fixation and photosynthesis

Identify the cycle pictured

• Water cycle
• Carbon cycle
• Nitrogen cycle
• Phosphorus cycle

In the carbon cycle, what do plants and other producers take in when they carry out photosynthesis?

• carbon dioxide
• phosphorus
• oxygen
• nitrogen

True or False: Nitrogen in the atmosphere is useable

• True
• False

What cycle is demonstrated in this diagram?

• Carbon cycle
• Nitrogen cycle
• Water cycle
• Phosphorous cycle

Identify the cycle pictured

• Carbon cycle
• Nitrogen cycle
• Water cycle
• Phosphorus cycle

What process is shown by #1?

• Evaporation
• Condensation
• Precipitation
• Transpiration