📐 Nitrogen Cycle Diagram Class 8

The nitrogen cycle describes how nitrogen gas in the air is converted into forms plants can use, passed through the food chain, and eventually returned to the atmosphere by bacteria.

Why It's Important

1. Nitrogen is essential for building proteins and DNA
2. Plants can't use nitrogen gas directly without this cycle
3. Keeps soil fertile for growing crops
4. Balances nitrogen between air, soil, and living things

Observation Points

1. Trace nitrogen's path from the atmosphere into the soil
2. Follow it from soil into a plant's roots
3. Notice how it moves up the food chain
4. Identify where it returns to the atmosphere

Learning Objectives

1. Identify the main stages of the nitrogen cycle
2. Explain why plants need bacteria to use nitrogen
3. Describe how nitrogen moves through the food chain
4. Understand why the cycle is essential for all living things

Summary

The nitrogen cycle moves nitrogen between the air, soil, and living things through fixation, absorption, and decomposition, supplying a building block every organism needs.