The Nitrogen Cycle

To obtain the nitrogen they need, animals depend on many different microscopic ____________________ to convert nitrogen at all stages of the nitrogen cycle.

• protozoa

• bacteria

• worms

• insects

How animals get the nitrogen they need

• from the air they breathe
• from the water they drink
• from the food they eat
• from the Sun

Organisms that need nitrogen to survive

• only plants
• only animals
• only bacteria
• all living organisms

Tags

NGSS.MS-LS2-3

Organisms that play a role in the nitrogen cycle

• only plants
• only animals
• only bacteria
• plants, animals, & bacteria

Tags

NGSS.MS-LS2-2

How nitrogen is "fixed" into useable form for plants

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

Why are decomposers so important?

• They remove the dead body off of the forest flore

• They release the nutrients from a dead body into the soil

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-1

The NITROGEN that makes up the proteins and DNA in a body will eventually end up...

• in the soil

• in the air

Tags

NGSS.MS-LS2-3

What is the formula for atmospheric nitrogen?

• N

• N₂

• NH₃

• NO₃

What is the process where bacteria turns Nitrogen gas from the atmospheres into usable compounds?

• nitrogen composition

• nitrogen fixation

• ammonia

• denitrification

Tags

NGSS.MS-LS2-3

Plants and animals cannot use nitrogen directly from the air.

• True
• False