3
Question
A jawless fish which lays eggs in fresh water and whose ammocoete larvae after metamorphosis return to ocean is _____________.
A jawless fish which lays eggs in fresh water and whose ammocoete larvae after metamorphosis return to ocean is _____________.
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Solution
The correct option is D Petromyzon
D. PetromyzonReason: Petromyzon (Lamprey) are ectoparasites found in marine environment. It belongs to the Class Cyclostomata of Phylum Chordata. It is a jawless fish and lays eggs in fresh water. The eggs hatch within 3 weeks and form little transparent larvae called ammocoetes. After metamorphosis, the young lampreys swim down to the sea where they remain for 3 or 4 years before reaching maturity. They once again migrate to streams or rivers to spawn and die. Gonads become mature at that time when adults return to rivers for spawning. So the correct option is D.
D. Petromyzon
Reason: Petromyzon (Lamprey) are ectoparasites found in marine environment. It belongs to the Class Cyclostomata of Phylum Chordata. It is a jawless fish and lays eggs in fresh water. The eggs hatch within 3 weeks and form little transparent larvae called ammocoetes. After metamorphosis, the young lampreys swim down to the sea where they remain for 3 or 4 years before reaching maturity. They once again migrate to streams or rivers to spawn and die. Gonads become mature at that time when adults return to rivers for spawning. So the correct option is D.
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