Ciclo del Nitrógeno

The video explains the nitrogen cycle, highlighting its importance for living organisms. It covers the four main processes: nitrogen fixation, nitrification, decomposition, and denitrification. Nitrogen fixation involves converting nitrogen into absorbable compounds through biological, atmospheric, and industrial means. Decomposition and nitrification involve converting waste into ammonia and then nitrates. Denitrification completes the cycle by converting nitrates back to nitrogen gas, replenishing the atmosphere.

What percentage of Earth's atmosphere is composed of nitrogen?

• 78%

• 50%

• 99%

• 25%

Which process involves bacteria found in legumes converting nitrogen?

• Chemical fixation

• Biological fixation

• Industrial fixation

• Atmospheric fixation

What is the role of decomposers in the nitrogen cycle?

• They break down waste into ammonia.

• They release nitrogen gas into the atmosphere.

• They convert ammonia into nitrates.

• They fix nitrogen from the atmosphere.

During nitrification, ammonia is converted into what compound?

• Nitrites

• Ammonium

• Nitrates

• Nitrogen gas

What process reduces nitrates back to nitrogen gas?

• Nitrification

• Denitrification

• Nitrogen fixation

• Decomposition