The sexual reproduction in Spirogyra is

Oogamous

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Isogamous

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Cleistogamous

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conjugation

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Solution

The correct option is B conjugation
In Spirogyra sexual reproduction takes place through scalariform (ladder like) conjugation or lateral conjugation. Where conjugation tubes emerge and connect opposite cells on parallel filaments or adjacent cells of the same filament respectively. The contents of one cell, then termed as male cell/gamete moves into the connected cell, and fusion of cytoplasm and nuclei takes place. Fusion of the nuclei results in the formation of the zygote.
So, the correct answer is 'conjugation'

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