Nitrogen Cycle

What is the process by which ammonia is converted into nitrite by bacteria?

• Denitrification

• Nitrification

• Ammonification

• Nitrogen fixation

Which process converts nitrite into nitrate in the nitrogen cycle?

• Ammonification

• Nitrogen fixation

• Denitrification

• Nitrification

What is the term for the process where nitrogen gas is converted into ammonia by nitrogen-fixing bacteria?

• Nitrogen fixation

• Gas conversion

• Nitrogen transformation

• Ammonia synthesis

Which process involves the conversion of organic nitrogen into ammonia?

• Denitrification

• Nitrification

• Photosynthesis

• Ammonification

What is the process by which plants take up nitrogen compounds from the soil?

• Photosynthesis and respiration

• Transpiration and evaporation

• Nitrogen fixation and decomposition of organic matter

• Germination and pollination

What is the primary source of energy for nitrifying bacteria?

• Ammonia (NH3) or nitrite (NO2-)

• Oxygen (O2)

• Carbon dioxide (CO2)

• Phosphorus (P)

Which type of bacteria carry out denitrification in the nitrogen cycle?

• Bacillus

• Escherichia

• Streptococcus

• Pseudomonas, Paracoccus, and Thiobacillus

What is the end product of denitrification?

• Oxygen gas (O2)

• Nitrogen gas (N2)

• Carbon dioxide (CO2)

• Water (H2O)

Which process releases nitrogen gas back into the atmosphere?

• Nitrogenation

• Denitrification

• Nitrogenization

• Nitrogenation

What is the role of decomposers in the nitrogen cycle?

• Decomposers break down organic matter and release nitrogen back into the soil.

• Decomposers absorb nitrogen from the soil

• Decomposers convert nitrogen into oxygen

• Decomposers release carbon dioxide into the atmosphere