Explanation:

The tribes of India are classified into different groups on the basis of geographical location, language, race and levels of their socioeconomic development.
When we talk of racial groups, there are three broad classifications (1) the Mongoloid, (2) the Proto-Austroloid, (3) the Negrito.
• The Mongoloid: The North-North-Eastern tribes living in the Himalayan regions belong to the Mongoloid race.
• The Australoid: The tribes of central India are mainly Proto-Australoid in their racial ancesting.
• The Negrito: A few tribes like the Kadar of the south and the Andamanese of the Andaman Islands belong to this race.