Estimating Global Species Diversity — NEET Biology

Which of the following statements regarding global and Indian biodiversity are correct? S1: India accounts for 2.4% of the world's land area and 8.1% of the global species diversity, making it one of the 12 mega-diversity countries. S2: According to IUCN (2004), the total number of plant and animal species described so far globally is slightly more than 1.5 million. S3: Among animals, insects are the most species-rich taxonomic group, comprising less than 50% of the total animal species. S4: India has recorded nearly 45,000 species of plants and twice as many animal species. S5: Robert May's conservative estimate places global species diversity at about 7 million, with a large proportion of species waiting to be discovered in temperate regions.