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B
kidney
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C
ovary
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D
lungs
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Solution
The correct option is B kidney Bidder's canal is a structure which is present longitudinally in the kidney of a male frog. It communicates with urinogenital duct which opens into the cloaca. The Bidder's canal receives the sperms through vasa efferentia and passes it to the urinogenital duct.
Male frogs possess a pair of male reproductive organs called testes. Testes are reponsible for the production of male gametes called sperms.
Female frogs possess female reproductive organs called ovaries. These ovaries can produce 2500 to 3000 ova at once.
Lungs are respiratory organs that help in gaseous exchange.