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Question
Assertion (A): The primitive atmosphere was reducing atmosphere, i.e., without free oxygen.
Reason (R): In the primitive atmosphere, oxygen was involved in forming ozone.
Options
Both assertion (A) and reason (R) are true, and reason is the correct explanation of assertion.
Both assertion (A) and reason (R) are true, but reason is not the correct explanation of assertion.
Assertion (A) is true but reason (R) is false.
Both assertion (A) and reason (R) are false.
MCQ
Assertion and Reasoning
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Solution
Assertion (A) is true but reason (R) is false.
Explanation:
The primitive atmosphere was reducing and lacked free oxygen. Ozone formed later from oxygen that accumulated after photosynthesis evolved, so the reason is false.
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