Life cycle of Spirogyra/Chlamydomonas is

Haplobiontic/Haplontic

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Diplobiontic

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Haplodiplobiontic

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Diplontic

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Solution

The correct option is A Haplobiontic/Haplontic
Life cycle in Chlamydomonas, Ulothrix, Spirogyra is haplontic. In haplontic life cycle, the dominant phase is haploid, and the diploid phase is of a very short duration,that is, when the zygote is formed by fusion of two haploid cells.
So, the correct answer is 'Haplontic'

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