Topics
CISCE: Class 12
Key Points: Kinds of Succession
| Type of Succession | Basis | Description | Examples |
|---|---|---|---|
| Primary Succession | First colonisation | Occurs on bare areas with no previous life | Bare rock, pond → dry land (hydrosere) |
| Secondary Succession | Recolonisation | Occurs on previously inhabited areas after disturbance | Forest after fire, flood, landslide |
| Autogenic Succession | Community-controlled | Caused by environmental changes produced by organisms themselves | Soil formation by plants |
| Allogenic Succession | External factors | Caused by external forces like climate, floods, fire | Floods, volcanic activity |
| Autotrophic Succession | Type of organisms | Dominated by producers; begins in inorganic environment | Forest development |
| Heterotrophic Succession | Type of organisms | Dominated by consumers; begins in organic environment | Decaying logs, dung heaps |
