The nitrogen cycle - Biology

What is the first stage of the nitrogen cycle

Nitrogen from the air is converted into nitrates in the soil by nitrogen fixing bacteria

What is the second stage of the nitrogen cycle

The nitrates are then absorbed by plants and are used to make amino acids

What is the third stage of the nitrogen cycle

The amino acids then pass into animals when they eat the plants

What is the fourth stage of the nitrogen cycle

Animals release waste products such as urea and both plants and animals die

What is the fifth stage of the nitrogen cycle

There is nitrogen in waste products and dead remains

What is the sixth stage of the nitrogen cycle (DB)

Decomposing bacteria now convert the nitrogen to ammonia

What is the final stage of the nitrogen cycle?

Nitrifying bacteria converts the ammonia to nitrates so the nitrates can now be absorbed again by the plants and the cycle continues

Nitrates can be produced by soil bacteria. Explain how soil bacteria produces nitrates

Decomposing bacteria break down dead matter and plant matter in the soil into ammonia. Ammonia is converted into nitrates in the soil by nitrifying bacteria