Assertion :True nucleus is absent in E. coli and other prokaryotes. Reason: An undifferentiated, unorganised, fibrillar nucleoid without any limiting membrane is found in prokaryotic 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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Assertion is incorrect but Reason is correct.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
E. coil is a prokaryotic bacteria. True nucleus and membrane-bound organelles such as mitochondria, Golgi body, etc are absent in prokaryotes. There is an undifferentiated, unorganized fibrillar nucleoid without any nuclear membrane in prokaryotic cells. The genetic material of prokaryotic cell is not bound within any limiting membrane and is dispersed in cytoplasm.
Thus, the correct answer is option A.

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