Read the following conservation strategies: I. Seed banks II....

Conservation strategies are broadly classified into in situ (on-site) and ex situ (off-site) conservation.

Ex situ conservation involves protecting endangered species of plants and animals outside their natural habitats. Examples include botanical gardens, zoological parks, wildlife safari parks, seed banks, and cryopreservation techniques.

In situ conservation involves protecting species in their natural habitats. Examples include national parks, wildlife sanctuaries, biosphere reserves, and sacred groves.

From the given list:
I. Seed banks $\rightarrow$ Ex situ
II. Sacred groves $\rightarrow$ In situ
III. Botanical gardens $\rightarrow$ Ex situ
IV. Biosphere reserves $\rightarrow$ In situ

Therefore, I and III are considered ex situ conservation methods.

Answer: I and III only