Assertion (A): Cyclostomes are marine but migrate for spawning to freshwater. Reason (R): Larvae of cyclostomes metamorphose in marine water.
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a
A is correct but R is incorrect
b
R is correct but A is incorrect
c
A and R are correct
d
A and R are incorrect
answer is A.
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Detailed Solution
Cyclostomes are marine but migrate for spawning to fresh water. After spawning, within a few days, they die. Their larvae, after undergoing metamorphosis return to the ocean.