This document discusses biosphere reserves, which are designated by UNESCO to balance environmental conservation and human development. Biosphere reserves have three zones - a fully protected core area, a buffer zone where limited activities are allowed, and an outer transition zone where sustainable economic activities take place. The document outlines the criteria for designation, functions, and structure of biosphere reserves. It also discusses India's participation in UNESCO's Man and Biosphere Programme through its establishment of 11 biosphere reserves within the country.