A : During evolution,the early time period wa | vedclass

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(B) The early atmosphere of Earth was a reducing atmosphere and lacked free oxygen,which is required for the formation of the ozone layer $(O_3)$.Ther

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Assertion and Reason both are correct but Reason is not the correct explanation of Assertion.

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(B) The early atmosphere of Earth was a reducing atmosphere and lacked free oxygen,which is required for the formation of the ozone layer $(O_3)$.Therefore,the early time period was indeed without an ozone layer.$UV$ rays from the sun were able to reach the Earth's surface in the absence of the ozone layer,which played a crucial role in the synthesis of organic molecules.The ozone layer,in the present atmosphere,acts as a shield by absorbing harmful $UV$ rays.Since the absence of the ozone layer in the early period is a historical fact and the property of the ozone layer to absorb $UV$ rays is a scientific fact,both are correct,but the Reason does not explain why the early period lacked an ozone layer.

$A$ : During evolution,the early time period was without an ozone layer.
$R$ : The ozone layer absorbs $U.V.$ rays to some extent.

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$A$ : During evolution,the early time period was without an ozone layer.$R$ : The ozone layer absorbs $U.V.$ rays to some extent.