Ncert Exercises & Solutions

Biosphere is

1.	a component in the ecosystem
2.	composed of the plants present in the soil
3.	life in the outer space
4.	composed of all living organisms present on earth which interact with the physical environment

(d) Biosphere is composed of all living organisms present on earth which interact with their physical environment. In other words, a biosphere or ecosphere term is collectively used for all the ecosystems of the world. Ecosphere or biosphere can not be defined by the other three options, as they represent only a part of the ecosystem.

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