Nitrogen cycle

According to this diagram, plants use nitrogen to make _________________________

• bacteria

• animals

• proteins

• decomposers

A correct path that nitrogen could take would be

• air -> animals -> plants -> bacteria

• animals -> air -> bacteria -> plants

• bacteria -> air -> plants -> animals

• air -> bacteria -> plants -> animals

Which process makes nitrites from ammonia?

• ammonification

• denitrification

• nitrification

• nitrogen fixation

The biological transformation of ammonia or ammonium to nitrites and nitrates.

• ammonification

• denitrification

• nitrification

• nitrogen fixation

What converts nitrogen gas into a usable form for plants and animals?

• bacteria

• rain

• fungi

• car exhaust

What is the formula for atmospheric nitrogen?

• N

• N₂

• NH₃

• NO₃

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

• Assimilation

• Fixation

• Ammonification

• Denitrification

Match the following steps of the nitrogen cycle to how they move bacteria.

• Ammonification

• Atmosphere to Geosphere

• Denitrification

• Geosphere to Biosphere

• Nitrogen Fixation

• Geosphere to Atmosphere

• Assimilation

• Biosphere to Geosphere

How do plants get the nitrogen they need?

• from the air
• from the soil or water in which they live
• from the Sun
• from broken-down rocks

Bacteria fix nitrogen on plant roots. Plant roots provide sugar to bacteria. This is an example of _______.

• mutualism
• parasitism
• commensalism
• competition