Assertion :Lancelets are jawless, primitive fish like vertebrates. Reason: In lancelets notochord, tubular nerve cord and pharyngeal gills slits arePresent throughout their life.

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 incorrect and Reason is correct.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is C Assertion is incorrect and Reason is correct.
Lancelets or amphioxus are not vertebrates. Cilia-driven currents ‘suck’ water into the mouth and across the pharyngeal gills. A lancelet has a long body, pointed at both ends, with a large notochord that extends almost from tip to tip and is present throughout life. At one end is a mouth surrounded by prominent bristles and leading into a pharynx. The pharynx has gill slits, an endostyle similar to that of a sea squirt, and an atrium surrounding the pharynx. Water enters the mouth and leaves through the gill slits, and food is trapped in the pharynx. The dorsal, tubular nerve cord is slightly enlarged in the anterior region, forming a rudimentary brain.

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