EcologyDiagram

The Nitrogen Cycle — Tap or Play to Explore

Part of The Nitrogen Cycle · GCSE GCSE Biology revision

This diagram covers The Nitrogen Cycle — 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.

Topic position

Section 4 of 14

Practice

15 questions

Recall

15 flashcards

🌱 The Nitrogen Cycle — Tap or Play to Explore

Keep building this topic

Read this section alongside the surrounding pages in The Nitrogen Cycle. That gives you the full topic sequence instead of a single isolated revision point.

The Nitrogen Cycle Step by Step How It Works: Why Bacteria Are Essential Why Do Farmers Add Fertiliser?The Big Picture: Nitrogen's Journey

Practice Questions for The Nitrogen Cycle

What percentage of the atmosphere is made up of nitrogen gas (N₂)?

A. 21%
B. 0.04%
C. 78%
D. 50%

1 markfoundation

Explain the difference between nitrifying bacteria and denitrifying bacteria, including the conditions in which each type thrives.

3 marksstandard

Quick Recall Flashcards

What is nitrogen fixation?

The conversion of atmospheric nitrogen gas (N₂) into ammonia (NH₃) 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.

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The Nitrogen Cycle Step by Step

How It Works: Why Bacteria Are Essential