Assertion :Lancelets are jawless primitive fish-like vertebrates Reason: In lancelets notochord, tubular nerve cord and pharyngeal gill slits are present throughout their life

A is correct but R is wrong

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A is wrong but R is correct

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Both A and R are correct and R is correct explanation of A

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Both S and R are correct and R is not correct explanation of A.

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Solution

The correct option is B A is wrong but R is correct
Lancelet is a cephalochordate which is not included in Vertebrata. It is included under the phylum Chordate but it is not a vertebrate. Thus, the assertion is wrong. In Cephalochordates, notochord that extends from head to tail, nerve cord and pharyngeal gill slits are present throughout their life.
Hence 'Assertion is wrong but the reason is correct' is the right answer.

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