• Statement A is true. Current conventional taxonomic methods are unsuitable for identifying many microbial species because many cannot be cultured in laboratories. If biochemical or molecular criteria are used to delineate these species, their diversity is estimated to reach into the millions.

•Statement B is true. There are 12 mega diversity countries identified globally (including India), which collectively harbor a significant portion of the Earth’s total species.

•Statement D is true. The Western Ghats are known to have a significantly greater diversity of amphibian species compared to the Eastern Ghats due to their consistent rainfall and humid tropical climate.