Question 1

What is denitrification in the nitrogen cycle?

Accepted Answer

Conversion of nitrates back into nitrogen gas (N2)

Answer

Conversion of nitrites into nitrates

Answer

Conversion of ammonium into nitrites

Answer

Conversion of nitrogen gas (N2) into nitrates

Question 2

What is the primary role of bacteria in the nitrogen cycle?

Accepted Answer

Convert nitrogen gas (N2) into a usable form for plants

Answer

Provide nitrogen to animals

Answer

Break down organic matter

Answer

Release nitrogen gas (N2) into the atmosphere

Question 3

What is the role of plants in the nitrogen cycle?

Accepted Answer

Absorb nitrogen to make proteins and DNA

Answer

Fix atmospheric nitrogen gas (N2)

Answer

Convert nitrates back into nitrogen gas (N2)

Answer

Release nitrogen gas (N2) into the atmosphere

Question 4

What is ammonification in the nitrogen cycle?

Accepted Answer

Conversion of organic nitrogen into ammonium (NH4+)

Answer

Fixation of atmospheric nitrogen gas (N2) into ammonia (NH3)

Answer

Conversion of ammonium into nitrite (NO2-) and then to nitrate (NO3-)

Answer

Conversion of nitrite (NO2-) into nitrate (NO3-)

Question 5

What is the main source of nitrogen for the nitrogen cycle?

Accepted Answer

Atmospheric nitrogen gas (N2)

Answer

Nitrite (NO2-)

Answer

Nitrate (NO3-)

Answer

Ammonium (NH4+)

Question 6

What is nitrogen fixation in the nitrogen cycle?

Accepted Answer

Conversion of atmospheric nitrogen gas (N2) into ammonium (NH4+)

Answer

Conversion of nitrite (NO2-) into nitrate (NO3-)

Answer

Conversion of nitrates back into nitrogen gas (N2)

Answer

Conversion of ammonium into nitrite (NO2-)

Question 7

What is nitrification in the nitrogen cycle?

Accepted Answer

Conversion of ammonium (NH4+) into nitrite (NO2-) and then to nitrate (NO3-)

Answer

Conversion of nitrate (NO3-) back into atmospheric nitrogen gas (N2)

Answer

Conversion of nitrite (NO2-) into ammonium (NH4+)

Answer

Conversion of atmospheric nitrogen gas (N2) into ammonium (NH4+)

Question 8

What is the process called when nitrogen returns to the atmosphere?

Accepted Answer

Denitrification

Answer

Ammonification

Answer

Nitrification

Answer

Nitrogen fixation

Question 9

What is assimilation in the nitrogen cycle?

Accepted Answer

Incorporation of organic nitrogen into plant and animal tissues

Answer

Conversion of atmospheric nitrogen gas (N2) into ammonia (NH3)

Answer

Conversion of nitrates back into nitrogen gas (N2)

Answer

Conversion of ammonium into nitrites and nitrates

Question 10

Which organism is responsible for nitrogen fixation in the soil?

Accepted Answer

Rhizobium bacteria

Answer

Actinomycete bacteria

Answer

Azotobacter bacteria

Answer

Mycorrhizal fungi

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