This diagram covers The Nitrogen Cycle โ Tap or Play to Explore within The Nitrogen Cycle for GCSE Biology. The nitrogen cycle: nitrogen-fixing, nitrifying, denitrifying bacteria, ammonification, and the role of legumes It is section 4 of 14 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.
Practice questions for The Nitrogen Cycle
What percentage of the atmosphere is made up of nitrogen gas (Nโ)?
Explain the difference between nitrifying bacteria and denitrifying bacteria, including the conditions in which each type thrives.
Quick recall flashcards
What is nitrogen fixation?
The conversion of atmospheric nitrogen gas (Nโ) into ammonia (NHโ) by nitrogen-fixing bacteria. This is the entry point of atmospheric nitrogen into the food chain.
What is ammonification?
The process by which decomposers (bacteria and fungi) break down nitrogen-containing molecules (proteins and DNA) in dead organisms and waste products, releasing ammonia into the soil.