Understanding the Nitrogen Cycle

What percentage of our atmosphere is made up of nitrogen?

• 78%

• 21%

• 10%

• 5%

Why can't humans directly breathe in nitrogen to utilize it?

• It is too scarce

• It is too abundant

• It is only found in water

• It is not in the right form

What process converts atmospheric nitrogen into ammonia?

• Ammonification

• Denitrification

• Nitrification

• Nitrogen fixation

Tags

NGSS.MS-LS2-3

Which natural phenomenon can also perform nitrogen fixation?

• Volcanic eruptions

• Earthquakes

• Tsunamis

• Lightning

What is the toxic substance produced during nitrogen fixation?

• Ammonia

• Nitrite

• Nitrate

• Hydrogen

What form of nitrogen can plants directly absorb?

• Ammonia

• Nitrate

• Nitrogen gas

• Nitrite

Tags

NGSS.MS-LS2-1

What process involves bacteria converting nitrite into nitrate?

• Ammonification

• Nitrification

• Denitrification

• Assimilation

What happens to nitrogen after it is used by plants?

• It becomes water

• It evaporates

• It returns to the atmosphere

• It remains in the soil

Tags

NGSS.MS-LS2-3

How do animals contribute to the nitrogen cycle?

• By breathing nitrogen

• By eating soil

• Through waste and death

• By drinking water

Tags

NGSS.MS-LS2-3

What is the final call to action mentioned in the video?

• Subscribe and share the video

• Join a science club

• Visit a science museum

• Read a book