Nitrogen Cycle

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 do animals get the nitrogen they need?

• From the air they breathe

• From the water they drink

• From the food they eat

• From the sun

What is the formula for atmospheric nitrogen?

• N

• N₂

• NH₃

• NO₃

Gas that makes up 78% of our atmosphere.

• Oxygen

• Nitrogen

• Hydrogen

• Carbon Dioxide

According to this diagram, plants use nitrogen to make _________________________

• bacteria

• animals

• proteins

• decomposers

According to this diagram, plants absorb

• nitrates

• nitrogen fixing bacteria

• animals

• decomposers

According to this diagram, animals get proteins from eating ________________________

• decomposers

• bacteria

• plants

• sunlight

Bacteria fix nitrogen from the atmosphere into a form plants can use.

• True

• False

What is the process where plants use nitrates to grow?

• Nitrogen Fixation

• Ammonification

• Assimilation

• Nitrification