The zone of air, water and land where living organisms exist, called as
A. Lithosphere
B. Biosphere
C. Ecosystem
D. None of the above.

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Hint: The living organisms depend upon various substances that are present on the earth. The different substances on the earth can be classified as the biotic components and the abiotic components. The biotic components are the living organisms such as plants, animals, human and microscopic organisms. The abiotic components are the soil, temperature, water and minerals.

Complete answer:
Both abiotic and biotic components are present on the earth and are essential for sustaining life. The abiotic components are the nonliving part of the earth and include all the physio-chemical substances. These components affect the growth, distribution and other properties of the living organism. The abiotic and biotic components are interrelated with each other.
The area or zones of air, water and land where the biotic organisms can exist are known as the biosphere. The biosphere consists of both biotic and abiotic factors in which both are interrelated with each other as they derive energy and nutrients. The biosphere maintains a system of continuous cycling matter and flow of energy within the living organism and abiotic materials. It is referred to as the zones where the living organisms are present. A biosphere includes all the different types of ecosystems that are present.
The ecosystem is the community or functional unit of living organisms that interact with the non-living components within a particular area. Ecosystems are dependent on the particular climatic conditions of a particular area and in return it affects the distribution of living organisms. Different types of ecosystems are desert ecosystem, aquatic ecosystem, terrestrial ecosystem and forest ecosystem.
Lithosphere is the outermost layer of the earth and is composed of the crust and the mantle and the innermost core. The upper mantle is the rigid hard surface of the earth. The upper crust reacts and continues with the other layers such as the atmosphere, hydrosphere, biosphere etc. The crust is divided into several tectonic plates. Below the crust, the mantle is present.

Hence, the correct answer is option (B).

Note: The living and nonliving components found on earth are interrelated with each other and through their interdependent relationships exist together in a zone which is known as the biosphere. The biosphere is the zone of air, water and other abiotic factors where the living organism lives and survives.