Which one is not a reservoir of oxygen?

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Biosphere

Lithosphere

Exosphere

Atmosphere

answer is D.

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Detailed Solution

The exosphere is not an oxygen reservoir, as it is the outermost layer of the atmosphere.
The atmosphere is a layer of air that surrounds the earth and is primarily composed of nitrogen, oxygen and traces of gases such as water vapour, carbon dioxide, neon, and helium.
The biosphere is the thin layer of the earth's surface that supports life, extending from a few kilometres into the atmosphere to deep-sea vents. It is made up of living things that provide energy and nutrients to organisms.
The rock and crust surface that covers the earth is referred to as the lithosphere.
The main reservoirs of the oxygen cycle are the atmosphere, the biosphere, and the lithosphere.

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