Nitrogen Quiz

What is nitrogen an important component for?

• Building proteins in plants and animals

• Making food for humans

• Helping animals breathe

• Creating sunlight for plants

How much of the air around us is made up of nitrogen gas (N₂)?

• 50%

• 60%

• 78%

• 90%

Why is nitrogen gas called "free" nitrogen?

• It is free to move around the earth

• It is not combined with other kinds of atoms

• It is free of charge for plants

• It floats on water

What is nitrogen fixation?

• A process that turns nitrogen into oxygen

• A process that changes nitrogen gas into a usable form

• A process that breaks down nitrogen

• A process that creates new nitrogen atoms

Which organisms perform most nitrogen fixation?

• Trees

• Bacteria living in nodules on legume plants

• Fish

• Insects in the soil

Which of the following plants are examples of legumes that help with nitrogen fixation?

• Clover, beans, and peas

• Oak trees, roses, and grass

• Corn, rice, and wheat

• Pine trees, daisies, and tomatoes

What percentage of nitrogen needed by plants is fixed by lightning?

• 5%

• 10%

• 20%

• 50%

Tags

CCSS.5.NF.B.3

What do producers use fixed nitrogen for?

• Building proteins and other complex molecules

• Building food for animals

• Helping make sunlight

• Breaking down waste

What happens to nitrogen after it is used by producers and consumers?

• It is destroyed forever

• It returns to the air as free nitrogen

• It stays in the soil permanently

• It becomes oxygen

What law is demonstrated by the nitrogen cycle?

• Law of Gravity

• Law of Energy Conservation

• Law of Conservation of Mass

• Law of Ecosystems