Q.

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

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a

haploid vegetative cells and diploid gametangia

b

diploid vegetative cells and diploid gametangia

c

diploid vegetative cells and haploid gametangia

d

haploid vegetative cells and haploid gametangia

answer is D.

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Detailed Solution

In a multicellular filamentous alga (e.g., Ulothrix), the sexual life cycle have meiotic division after the zygote (2n) formation. It means meiosis in zygote will produce haploid spores or vegetative cells (n) and when these vegetative cells undergo asexual reproduction the gametophyte or gametangia formed will be haploid (n) too.
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A multicellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has