Nitrogen

Which of the following best explains why nitrogen fixation (when bacteria in the soil change atmospheric nitrogen into nitrogen for plants & animals) must take place?

• Atmospheric nitrogen is unusable to plants and animals

• Nitrogen must be returned to the atmosphere

• Animals must breathe in nitrogen

• Nitrogen gets "stuck" in the soil and must be untrapped

Tags

NGSS.MS-LS2-3

When nitrogen gas is turned in to a form that plants and animals can use is called...

• Combustion

• Photosynthesis

• Decomposition

• Nitrogen Fixation

Tags

NGSS.MS-LS2-3

Organisms need nitrogen in order to...

• To breathe

• To obtain water for growth

• To build proteins & DNA

• To regulate temperature

Tags

NGSS.MS-LS3-1

In addition to lightning, what are three other ways nitrogen enters the soil and is fixed into a usable form for organisms? (Select THREE answers)

• Fertilizers

• Decomposition of organic matter

• Bacteria fixation

• Denitrification

• Plant consumption

Tags

NGSS.MS-LS2-3

Which process makes nitrites from ammonia?

• ammonification

• denitrification

• nitrification

• nitrogen fixation

makes nitrites from ammonia.

• ammonification

• denitrification

• nitrification

• nitrogen fixation

Answer explanation

Nitrification is the process where ammonia is converted into nitrites by bacteria. This distinguishes it from ammonification, denitrification, and nitrogen fixation, which involve different nitrogen transformations.

Which of the following organisms are essential for the nitrogen cycle?

• Bacteria

• Plants

• Animals

• People

Tags

NGSS.MS-LS2-3

Nitrogen-fixing bacteria are found in...

• root nodules of legumes

• plants

• animals

• decomposers

Tags

NGSS.MS-LS2-3

What is the only form of nitrogen that non-legume plants can take in and use?

• Nitrates

• Nitrites

• Diatomic nitrogen

• Ammonium

Tags

NGSS.MS-LS2-3

Animals get the nitrogen they need...

• from the air they breathe

• from the water they drink

• from the food they eat

• from the Sun

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3