India is recognised as one of the world's megadiverse countries because it harbours approximately:
India occupies about 2.4% of the world's land area but accounts for about 8.1% of the recorded global species diversity, making it one of the 12 megadiverse countries.
Ref: NCERT Class 12 Biology Chapter 13: Biodiversity and Conservation Biodiversity - Levels - Genetic Species Ecological