| TERMS | Definations |
| Ecology | Ecology is defined as the study of the relationship of organisms to their environment. |
| Environment | The physical and biological conditions under which an organism lives is called environment. |
| Population | The group of inter-breeding individuals belonging to same species and living in a common geographic area is called population. |
| Community | All populations within an ecosystem are known as a community. |
| Biomes | The major regional ecological community of plants and animals arc called bionics. – |
| Ecosystem | A biological community together with the associated abiotic environment is called ecosystem. |
| Autecology | The study of relationship of a single population to ‘ its environment is called autecology. |
| Synecology | The study of relationship of different communities or group of population to their environment is called synecology or community ecology. |
| Ecological niche | The basic role or profession of an organism in a community is called ecological niche. |
| Deforestations | Clearance of vast areas of forest for number. planting subsistence crops or grazing cattle is called as deforestation. |
| Reforestation | The replantation of trees in a forest is called reforestation |
| Wild life | All non-cultivated plants and non-domesticated animals are included in wild life. |
| Watershed | An area from which water fall in the form of rain or snow collects into a stream and river is called watershed. |
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