CH 3: Ecosystem Ecology

When nitrogen gas is turned in to a form that plants and animals can use is called 

• Combustion
• Photosynthesis
• Decomposition
• Nitrogen Fixation

How do  animals get nitrogen?

• the atmosphere 
• eating other organisms
• bacteria
• lightning 

Building proteins and DNA is the reason organisms need what substance?

• Water
• Carbon
• Nitrogen
• Calcium

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What converts nitrogen into a useable form for plants and animals?

• bacteria
• fungi
• rain

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Which nutrient is not cycled through the atmosphere?

• carbon
• nitrogen
• phosphorous
• water

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NGSS.HS-ESS2-6

What role do decomposers play in the phosphorous cycle?

• absorb phosphorous 
• release phosphorous into atmosphere
• return phosphorous into the soil
• combustion

Tags

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This is released by the weathering of rocks.

• Carbon
• Oxygen
• Phosphorus
• Nitrogen

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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

Tags

NGSS.MS-LS2-3

What process occurs when dead plant and animal matter decomposes and nitrogen is released back into the atmosphere?

• Assimilation

• Fixation

• Ammonification

• Denitrification

Tags

NGSS.HS-LS2-3

The process that allows organisms to use nitrogen

• assimilation

• denitrification

• fixation

• ammonification