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Answer:

The life cycle of Spirogyra occurs via one of the three ways; vegetative, asexual, and sexual. ... This is observed during sexual reproduction where the life cycle of the organism alternated between the haploid filament and the diploid zygospore. The zygospore is the only diploid phase in the sexual life cycle.

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Spirogyra is a filamentous charophyte green algae that has gametophyte as its dominant phase in its life cycle. It is a free-living phase in its life-cycle. Complete answer: In Spirogyra, sexual reproduction has a cycle that alternates between a haploid gametophyte phase and a diploid zygospore phase.

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