Q.

Which of the following is incorrect about cyclostomes?

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a

Migrate to marine waters for spawning

b

Have 6 -15 pairs of gillslits

c

Ectoparasites on some fishes

d

Have a sucking and circular mouth

answer is C.

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Detailed Solution

Cyclostomes are marine but migrate for spawning to freshwater. After spawning, within a few days, they die. Their larvae, after metamorphosis, return to the ocean.

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