Nitrogen cycle

Nitrogen Cycle is a process through which nitrogen is converted into many forms, consecutively passing from the atmosphere to the soil to organism and back into the atmosphere.

• Nitrogen cycle

• Water cycle

• Oxygen cycle

• Carbon cycle

Why can plants not utilize naturally occurring nitrogen gas

• There are insufficient amounts available in the atmosphere

• Plants cannot break the triple bond between the two nitrogen atoms

Which of the following is most directly responsible for nitrogen fixation?

• bacteria

• Humans

• Plants roots

• Animals

• Sunlight

Which of the following biological processes is not linked to the nitrogen cycle

• Condensation

• Nitrogen fixation

• Ammonification

• Denitrification

Nitrification is the process of turning_into_

(a)  

How do plants obtain nitrogen

• From the soil using their roots

• From the atmosphere

• From water

• by breathing

What is the largest natural reservoir nitrogen on earth?

• The sun

• The biosphere

• The earth’s atmosphere

• The geosphere

Which of the following is not a way in which nitrogen is fixed?

• Lightening

• Deposition

• Volatilization

• Nitrogen-fixing bacteria

What is the main way that fixed nitrogen is released back into the atmosphere?

• Denitrifying microbes

• Crop harvests

• Runoff

• Erosion

What is the most common way that nitrogen fixation occurs?

• Fossil fuel combustion

• Nitrogen-fixing bacteria

• Lighting

• Forest fires