Number of uriniferous tubules in opisthonephric kidneys of frog are

1 million

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2 million

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2 thousand

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8 thousand

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Solution

The correct option is A 2 thousand
The number of uriniferous tubules in opisthonephric kidneys of frog are two thousand. The opisthonephros is the functional adult kidney. It can be traced in lampreys (cyclostomes), some of the fishes, and amphibians. It is formed from the extended mesonephros along with tubules from the posterior nephric ridge.
So, the correct answer is option C.

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