Nitrogen cycle

Organisms need nitrogen in order to...

• To breathe

• To obtain water for growth

• To build proteins & DNA

• To regulate temperature

Tags

NGSS.HS-LS1-1

Gas that makes up 78% of our atmosphere.

• Oxygen

• Nitrogen

• Hydrogen

• Carbon Dioxide

Based on the picture, what is the chemical formula for atmospheric nitrogen?

• N

• N₂

• NH₃

• NO₃

Tags

NGSS.MS-PS1-1

Which of these nitrogen cycle processes converts atmospheric nitrogen to a soil form of nitrogen that is usable by plants?

• nitrogen fixation

• nitrification

• denitrification

• ammonification

How nitrogen is "fixed" into useable form for plants...

• through action of bacteria only
• through lightning only
• through action of bacteria & lightning
• through photosynthesis

Tags

NGSS.MS-LS2-3

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

How does fertilizer affect the ecosystem?

• the bacteria reproduce quicker

• causes increase in rain, thereby increasing flooding of ponds and lakes

• create large algae blooms in the water

• cause the nitrogen fixing bacteria in the soil to be more productive

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

NGSS.MS-LS1-5

_____ is the conversion of organic nitrogen into ammonia

• Nitrogen Fixation
• Ammonification
• Denitrification
• Assimilation 

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

• bacteria

• rain

• fungi

• car exhaust

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

• Assimilation

• Fixation

• Ammonification

• Denitrification

Tags

NGSS.MS-LS2-3