In India, ecologically unique and biodiversity-rich regions are legally protected as

a. Biosphere reserves
b. Hotspots
c. National parks
d. Sacred groves
e. Wildlife sanctuaries

The correct option is B a, c and e
Biosphere reserves
Biosphere reserves include terrestrial, marine and coastal ecosystems that are nominated by the national government but remain under the jurisdiction of the state where they are located. These reserves are meant for the conservation of flora, fauna and human beings living in these areas. There are 18 biosphere reserves in India. Some of them are Nilgiri, Nanda devi, Sunderbans.

National parks
National parks are the areas that serve the purpose of conservation of biodiversity present in that particular area and are protected by the government.

Wildlife sanctuaries
Wildlife sanctuaries are the legally conserved areas where animal species and their habitats are protected from outside disturbances.

Final answer
b. a, c and e.