Nitrogen Cycle Processes and Bacteria

The video explains the role of soil bacteria in the nitrogen nutrition of plants. It covers how nitrogen, the most abundant gas in the atmosphere, is converted into forms usable by plants, such as ammonium and nitrate. The process involves nitrogen fixation by bacteria, conversion to ammonium, nitrification to nitrate, and denitrification, which returns nitrogen to the atmosphere, completing the nitrogen cycle.

Why can't plants directly use nitrogen from the atmosphere?

• Plants prefer carbon dioxide.

• It is not present in the atmosphere.

• Due to the presence of a triple bond in nitrogen molecules.

• Because it is too abundant.

What is the process called when nitrogen is converted into ammonia?

• Photosynthesis

• Ammonification

• Denitrification

• Nitrification

Which of the following is an example of nitrogen-fixing bacteria?

• Nitrosomonas

• Pseudomonas

• Bacillus

• Clostridium

What does ammonia pick up from the soil to become ammonium?

• Oxygen ions

• Nitrogen ions

• Hydrogen ions

• Carbon ions

Which process is responsible for converting dead plant amino acids into ammonium?

• Nitrification

• Ammonification

• Photosynthesis

• Denitrification

Which bacteria are involved in the conversion of ammonium to nitrate?

• Modifying bacteria

• Nitrogen-fixing bacteria

• Nitrifying bacteria

• Denitrifying bacteria

What role do nitrifying bacteria play in the nitrogen cycle?

• They convert nitrate to nitrogen gas.

• They decompose organic matter.

• They convert ammonium to nitrate.

• They fix nitrogen from the atmosphere.

What is the process called when nitrates are converted back to nitrogen gas?

• Denitrification

• Ammonification

• Nitrification

• Photosynthesis

Which of the following is a denitrifying bacterium?

• Clostridium

• Micrococcus

• Bacillus

• Nitrosomonas

How is nitrogen transported back to the atmosphere?

• Through ammonification

• Through photosynthesis

• Through nitrification

• Through denitrification