How many megadiverse countries are there in the world?

How many genetically different strains of rice are there in India?

Insects are the most numerous,with an estimate of:

Which of the following is correctly matched?
$I$. Alpha diversity - Number of species in a given habitat
$II$. Genetic diversity - Variation of the genes within species
$III$. Beta diversity - Diversity of the habitat in the whole region
$IV$. Species diversity - Product of the species richness and evenness

Which of the following regions is a biodiversity hotspot in India?

The total number of biodiversity hotspots currently identified worldwide is $.........$.