In Ulothrix / Spirogyra / Chlamydomonas, reduction division (meiosis) occurs at the time of

Gamete formation

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Zoospore formation

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Zygospore germination

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Vegetative reproduction

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Solution

The correct option is C Zygospore germination
At the time of zygospore, germination meiosis takes place in Ulothrix/Spirogyra. Under favourable conditions, zygospore undergoes zygotic meiosis to form motile tetra-flagellated comeiospoles or non-motile aplanomeiospores Each meiospore (haploid) germinates to the new filament of (+) (-) strain.
So, the correct option is 'Zygospore germination.'

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