Assertion : Cyclic pathway of photosynthesis | vedclass

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(A) The cyclic pathway of photosynthesis is considered the most primitive form of photosynthesis,which first appeared in ancient eubacterial species (

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If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) The cyclic pathway of photosynthesis is considered the most primitive form of photosynthesis,which first appeared in ancient eubacterial species (like purple and green sulfur bacteria) that did not evolve oxygen.Non-cyclic photophosphorylation ($Z$-scheme) involves the photolysis of water,which releases $O_2$ as a byproduct.As non-cyclic photosynthesis evolved,oxygen began to accumulate in the atmosphere,leading to the oxygenation of the Earth's atmosphere.Both the Assertion and Reason are correct,and the evolution of the non-cyclic pathway is the reason for the accumulation of atmospheric oxygen,which distinguishes it from the primitive cyclic pathway.

Assertion : Cyclic pathway of photosynthesis first appeared in some eubacterial species.
Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved.

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Assertion : Cyclic pathway of photosynthesis first appeared in some eubacterial species.Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved.