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|  |  |   
| 4 | Interaction between biotic and abiotic factors |   
| 5 | Transfer of energy from one trophic level to other |   
| 6 | Interconnected food chain |   
| 7 | Study of organisms and their surrounding environment |   
| 8 | Any discarded material on soil |   
|  |  |  
 
|  |  |   
| 1 | Pyramids of energy is always |   
| 2 | Kulhads are made up of |   
| 3 | Organisms feed on dead plants and animals |   
|  |  |