Pick the odd one out.
Gene bank, Zoological garden, Botanical garden, Sacred groves
Sacred groves
Two methods are adopted for the conservation of biodiversity - in situ and ex situ. In situ methods of conservation involves conserving the organisms in their natural habitat. Eg, Wildlife sanctuaries, national parks, bio-reserves, sacred groves, and community reserves. Ex situ conservation involves protecting organisms outside their natural habitats. Eg, zoological gardens, botanical gardens and gene banks. So, in the given list, sacred grove is the odd one out as it is a method of in situ conservation and others are ex situ conservation methods.