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Q.

Which of the following statements wrongly describes Petromyzon?

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a

It migrates to the sea for spawning.

b

It is ectoparasitic on fishes.

c

It exhibits indirect development.

d

It has a circular mouth without jaws.

answer is A.

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Detailed Solution

Petromyzon (lamprey) is marine but migrates for spawning to freshwater. After spawning, within a few days, they die. Their larvae, after metamorphosis, return to the ocean.

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