Decomposition – Process and Steps | Class 12 Ecology | NEET Biology
Автор: Biology with B.K. Sir
Загружено: 2026-01-01
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In this lecture, we will study Decomposition, an important topic from Class 12 Ecology (Ecosystem) for NEET, CBSE, and other competitive exams. Decomposition is the process by which complex organic matter is broken down into simpler inorganic substances by the action of decomposers like bacteria and fungi.
The lecture covers:
• Definition of Decomposition (NCERT based)
• Importance of decomposition in nutrient cycling
• Steps of Decomposition in correct sequence:
Fragmentation – breakdown of detritus by detritivores (e.g., earthworms)
Leaching – water-soluble nutrients move into the soil
Catabolism – enzymatic degradation by microbes
Humification – formation of humus (dark, amorphous substance)
Mineralisation – release of inorganic nutrients
Special focus on:
• Role of temperature, moisture, and oxygen
• Difference between humification and mineralisation
• NEET-oriented keywords, flow charts, and examples
This topic is highly important for NEET and frequently asked in MCQs and assertion–reason questions.
📌 Perfect for one-shot revision, concept clarity, and exam preparation.
📚 Biology with B.K. Sir
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