Nitrogen Cycle

When plants take in NH4 and convert it to usable N2

• nitrogen fixation
• nitrogen assimilation
• nitrogen denitrification
• nitrogen nitrification

Bacteria in oxygen-poor environments create nitrogen gas

• ammonification

• atmospheric fixation

• assimilation

• denitrification

Process where N2 in an organism’s body is changed to NH4 by decomposers

• nitrification
• denitrification
• ammonification
• nitrogen fixation

Bacteria and fertilizers add this compound to the soil

• 1. N2O

• NH4

• NO4

• NO3

Process where N2 is broken apart by lightning, and nitrogen compounds fall with the rain

• biological fixation

• atmospheric fixation

• industrial fixation

Type of relationship between plant roots and bacteria

• Free - living bacteria

• symbiotic relationship

• ammonification

• assimilation

Which characteristics accurately describe the element nitrogen?

• It makes up 78% of Earth’s atmosphere.

• There is no nitrogen in Earth’s atmosphere.

• All organisms use unreactive nitrogen gas.

• Most organisms cannot use unreactive nitrogen gas.

• • Nitrogen compounds are important parts of foods, fertilizers, and explosives.

 What is the largest reservoir that contains about 78% of all N2?

• atmosphere

• bacteria

• ocean

• animals

Which is not a compound found in the Nitrogen cycle?

• NO2

• NO3

• NO4

• NH4

Which is NOT a significant reservoir for nitrogen

• rivers/ streams

• plants

• bacteria

• atmosphere