Choose an appropriate option for the following.
Which step is not involved in the oxygen cycle?

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Decomposing

Transpiration

Rusting

Respiration

answer is D.

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Detailed Solution

Transpiration is not involved in oxygen cycle.
Oxygen cycle is a gaseous biogeochemical cycle, which begins with the photosynthesis process.
It has four main processes that are breathing, decomposition, rusting and combustion.
Respiration is the process of exchanging gases between the air and the cells of an organism. Breathing is a process which includes inhalation and exhalation.
Decomposition is the breakdown of compounds in once-living things and their return to the environment.
Rusting is an oxidation reaction, that takes place with iron in the presence of oxygen and water vapour. In this process iron acts as a reducing agent, completing the rusting process.
Transpiration is a process of release of excess water in the form of water vapour through the stomatal opening of the leaves.

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