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Q.

Which of the following undergoes metamorphosis?

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a

Petromyzon

b

Pristis

c

Pteropus

d

Psittacula

answer is A.

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Detailed Solution

Development in Petromyzon is indirect and includes a larval stage called ammocoete. Petromyzon is marine but migrates for spawning to fresh water. After spawning, within a few days, they die. Their larvae, after metamorphosis, return to the ocean.

Pristis (Chondricthyes), Pteropus (Mammalia), Psittacula (Aves) exhibit direct development. They do not undergo metamorphosis.

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