Correct Answer: (b) 18
Solution:In the year 2017 and at present(2022) also 18 biosphere reserves have been established in India. A biosphere reserve is a reserved area where human populations are also part of a wildlife conservation system. The Biosphere Reserve consists of 3 parts, Core Zone, Buffer Zone, and Transition Zone. Major Biosphere Reserves of India are Nilgiri, Nanda Devi, Gulf of Mannar, Nokrek, Sundarbans, Simlipol, Kanchenjunga, Panna etc.