Which of the following is not the character of sponge?

Gemma formation

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External fertilization

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Internal fertilization

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None of the above

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Solution

The correct option is B External fertilization
Fresh water sponge produces special bodies called as gemmules, which survive during unfavorable conditions and germinate to produce new sponges. Sexual reproduction involves internal fertilization. Male gametes enter the sponge body through water current and fertilize with ovum with the help of choanocytes.
Thus, the correct answer is option B.

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