The structure which remains unchanged during metamorphosis of frog's tadpole is [AIIMS 1998]
A) Lung
B) Heart
C) Intestine
D) Nervous system
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(B) Heart is not changed during the metamorphosis of frog's tadpole.
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The correct answer is option D- Nervous Sysytem
During Metamorphosis of a frog's tadpole, the nervous system doesn't change.
Reason: Metamorphosis is a thyroxin- mediated process which induces changes in he heart, lungs and intestine of a frog but brain is the only organ remains unchanged. It grows normally in its shape and size.
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