- bio-geographical regions
- similar ⤵️
- climatic conditions
- vegetation types
- associated animals
- association of plants & animals ➡️ interaction of species
Example: - Noni Fruit of Brazil ⤵️
- found to be anti-cancerous
- being cultivated in Andaman & Nicobar
- due to similar climatic condn
Types
- Hot deserts
- Cold deserts
- Tropical wet
- Deciduous, etc