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

1. gamete formation
2. zoospore formation
3. zygospore germination
4. vegetative reproduction

Correct answer: zygospore germination

Solution

Ulothrix and Spirogyra have a haplontic life cycle, so the only diploid stage is the zygospore. Reduction division occurs when the zygospore germinates, returning the organism to the haploid phase.

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