Assertion :Plasmids are single stranded extrachromosomal DNA. Reason: Plasmid are usually present in eukaryotic cells.

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 D Both Assertion and Reason are incorrect.
Plasmids are the double stranded extrachromosomal DNA. It is mainly used as a vector which plays an important role in the gene modification. It is present in prokaryotes like E.coli. It helps in the transformation when inoculated by a foreign gene.
So, the correct answer is 'Both Assertion and Reason are incorrect'

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