Photolysis is a part of which cycle?
a. phosphorus
b. oxygen
c. nitrogen
d. carbon

The correct answer is option b. oxygen.

The oxygen cycle is the regulation of the oxygen in its various reservoirs. These reservoirs are air, biosphere, hydrosphere and earth's crust. The photolysis is a process, in which the molecules breakdown in presence of water. During the process of photosynthesis the water and other molecules are broken into oxygen and other molecules. This oxygen is liberated in the atmosphere, giving out free oxygen in the air.

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