Which one of the following is not an ex situ conservation approach?

The correct answer is Option (3) → Wildlife sanctuaries

In ex situ conservation, threatened plants and animals are taken out of their natural habitat and kept in a special place where they get care. Zoological parks, botanical gardens and wildlife safari parks serve this purpose. Gametes can also be stored by cryopreservation. In in situ conservation, the species are protected in their own natural habitat, as in sanctuaries, national parks and biosphere reserves.

(1) Zoological parks — A method of ex situ conservation. Animals are kept and bred outside the wild.

(2) Botanical gardens — A method of ex situ conservation. Plants are grown and kept outside their natural habitat.

(3) Wildlife sanctuaries — Not a method of ex situ conservation. A sanctuary protects the animals inside their own natural habitat. This is in situ conservation.

(4) Wildlife safari parks — A method of ex situ conservation. The animals are kept in a special setting where they are cared for.

NCERT Extract:
How Do We Conserve Biodiversity? –