Discussion
Two statements labelled as Assertion (A) and Reason (R) are given. Read both the statements carefully and select the correct answer with the help of codes.
Assertion (A) : Earth is the only planet known to have life.
Reason (R) : Earth has an atmosphere which is a mixture of gases.
Answer: A
The answer is Both (A) and (R) are true, but (R) is not the correct explanation of (A).
The Assertion is true: Earth is the only planet on which life is known to exist. The Reason is also true: Earth's atmosphere is a mixture of gases, mainly nitrogen and oxygen with argon, carbon dioxide and others.
But having an atmosphere that is a mixture of gases does not explain why Earth has life. Venus and Mars also have atmospheres of mixed gases and no known life. Life depends on a combination of factors, such as liquid water, a suitable temperature range, free oxygen and protection from radiation. So the Reason does not explain the Assertion.
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