Which one of the following is not a site for in-situ method of conservation of flora ?

1. In-situ conservation means conserving species within their natural habitats or ecosystems. 2. Option (A) Biosphere Reserve: These are large protected areas aimed at conserving flora and fauna in their natural habitat, representing an in-situ method. 3. Option (C) National Park: These are areas set aside by the government for the protection and conservation of wildlife and their habitats, including flora. This is an in-situ method. 4. Option (D) Wildlife Sanctuary: These areas are dedicated to the protection of specific species or habitats, conserving flora and fauna in their natural environment. This is an in-situ method. 5. Option (B) Botanical Garden: A botanical garden involves collecting, cultivating, and displaying plant species *outside* their natural habitat, often for research, education, conservation, and display purposes. This is an example of ex-situ conservation, not in-situ. Therefore, a Botanical Garden is not a site for the in-situ method of conservation of flora.