AIIMS 2018 Biology Annelida Assertion Reason Question
Assertion: A piece of DNA inserted into an alien organism generally does not replicate if not inserted into a chromosome.
Reason: Chromosomes have specific sequences called ‘ori’ region where DNA replication is initiated.
Both assertion and reason are true, and the reason is the correct explanation for the assertion.
Both assertion and reason are true, but the reason is not the correct explanation for the assertion.
Assertion is true, but the reason is false.
Both assertion and reason are false.
Correct Answer
Detailed Explanation
Option A is correct because both the assertion that Lumbricus and Nereis belong to the phylum Annelida and possess nephridia, which are excretory structures, is true. Additionally, the reason provided accurately states that they possess nephridia, which supports the assertion, making it a correct explanation.
Option B is incorrect because the reason does indeed provide a correct explanation for the assertion. Option C is incorrect as both statements are true, and option D is false since both the assertion and reason are valid. Understanding the role of nephridia in excretion helps clarify the physiological adaptations of annelids like Lumbricus (earthworms) and Nereis (polychaetes).
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