Phosphorus and Nitrogen Cycles Quiz

What is the role of mycorrhizae fungi in the phosphorus cycle?

• They decompose organic matter to release phosphorus.

• They increase the absorption of phosphorus by plants.

• They release phosphate ions from rocks.

• They convert phosphate ions into nitrates.

Which process in the nitrogen cycle involves the conversion of nitrogen gas to ammonia?

• Ammonification

• Nitrification

• Nitrogen Fixation

• Denitrification

What is the intermediate substrate in the nitrification process?

• Nitrate

• Nitrite

• Nitrogen Gas

• Ammonium

Why are nitrate ions important for plants?

• They help in the absorption of water.

• They are essential for nucleic acid and protein synthesis.

• They are involved in the process of photosynthesis.

• They are used in the synthesis of phospholipids.

Which type of bacteria is responsible for converting nitrates back to nitrogen gas?

• Nitrogen-fixing bacteria

• Nitrifying bacteria

• Denitrifying bacteria

• Ammonifying bacteria