Assertion :Lamprey and Hagfish are marine cyclostomes. Reason: Cyclostomes have circular mouth and minute placoid scales.

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 C Assertion is correct but Reason is incorrect
Most of the Cyclostomes are marine but migrate for spawning to freshwater. After spawning within a few days, they die.
most of the species died about 345 million years ago the only living survivors are eel- looking lampreys and hagfishes.
Cyclostomes have circular mouth, skin is soft and slimy without scales,

So, the correct option is c.

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