1.

Assertion : The primitive atmosphere was reducing one i.e., without oxygen. Reason : In the atmosphere, oxygen was involved in forming ozone.A. If both assertion and reason are true and the reason is correct explanation of the assertion.B. If both assertion and reason are true but reason is not correct explanation of the assertionC. If assertion is true but reason is falseD. If both assertion and reason are false

Answer» Correct Answer - C
(C) Thus primitive atmosphere was reducing atmosphere (without free oxygen) unlike the present oxidizing atmosphere (with free oxygen). Formation of ozone layer is the consequence of modern oxidizing atmosphere having plenty of free oxygen.


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