49. All the ecosystems taken together in a geographical area form a bigger unit called :

(A) biosphere

(B) territory

(C) biome

(D) community

Ans. (C) Biosphere

ll ecosystems taken together make up the biosphere, all living organisms on the earth and their physical environment. The biosphere differs from other ecosystems in having fixed boundaries. The biosphere covers the whole surface of the earth. It begins underground and extends into the highest reaches of the atmosphere.

Source : biologyreference.com