Assertion :Archaebacteria are called as ancient bacteria. Reason: They can live in hostile environment particularly archae bacteria due to their unique plasma membrane.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Only Archaebacteria are known as ancient bacteria. They are ubiquitous and are found everywhere. Archaebacteria are abundant in hostile environments or the extreme conditions because they have unique membrane structure which helps them to survive in difficult conditions. The membrane contains isoprene units and has an ether linkage in phospholipids rather than the ester linkage. Thus, the correct answer is option A.

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