Which one of the following is not included under in situ conservation?
(b) Botanical garden
(c) Biosphere reserve
(d) National park
(b) Botanical gardens (i.e., institutions that maintain living plant collections representing a large number of species, genera and families) are the means of ex situ conservation (i.e., conservation outside the habitats).
Insitu conservation involves the conservation of genetic resources through their maintenance within natural or even human-made ecosystems in which they occur. It includes National parks, Sanctuaries, Biosphere reserves, Nature Reserves, Natural Monuments, Cultural Landscapes etc.