Dugesia shows

Transverse binary fission

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Longitudinal binary fission

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Oblique binary fission

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No binary fission

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Solution

The correct option is B Transverse binary fission
In Dugesia, asexual reproduction occurs by transverse binary fission. Fission occurs by appearance of constriction behind the pharnyx which gradually deepens and finally divides dugesia into two parts. Each part regenerates the other part and becomes the complete structure. So the correct answer is 'transverse binary fission'.

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