Explanation:

• Ex-situ conservation is done by preserving the components of biological diversity outside their natural habitats.
• It is done by conserving genetic resources, as well as wild and cultivated or species. Examples include Gene banks, Microbial cultures, Botanical Garden, Zoo etc.
• In-situ conservation is done by conserving the species in their natural habitats. It is the best way of biodiversity conservation.
• Examples include Sacred groves, National parks, Biosphere Reserve, Wildlife Sanctuary etc.

Source: http://www.oas.org/dsd/publications/unit/oea04e/ch04.htm