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Q.

In which of the following animals, respiration occurs without any specialized respiratory organ?

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a

Earthworm

b

Fish

c

Frog

d

Cockroach

answer is D.

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Detailed Solution

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  • There are no specialized breathing organs in earthworms. Through their skin, they breathe. 
  • Diffusion allows the exchange of gases (oxygen and carbon dioxide) through the skin of the earthworm.
  • As respiratory organs, fish have gills, frogs have lungs, and cockroaches have trachea.
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