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Q.

Which one is not a reservoir of oxygen?

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a

Atmosphere

b

Lithosphere

c

Biosphere

d

Exosphere

answer is D.

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Detailed Solution

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  • 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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