A multicellular, filamentous alga exhibits a type of sexual life cycle in which meiotic division occurs after the formation of the zygote. The adult filament of this alga has:

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Answer 1

Many algae show haplontic life cycle. In this case, the dominant phase is the free-living gametophyte.
Sporophytic generation is represented by single-celled zygote. Meiosis in zygote results in the formation of haploid spores, e.g. Spirogyra and Chlamydomonas.
So, the correct answer is 'Haploid vegetative cells and haploid gametangia'

Answer 2

Many algae show haplontic life cycle. In this case, the dominant phase is the free-living gametophyte.
Sporophytic generation is represented by single-celled zygote. Meiosis in zygote results in the formation of haploid spores, e.g. Spirogyra and Chlamydomonas.

So, the correct answer is 'Haploid vegetative cells and haploid gametangia'