Question

Why megaspore of pteritophyte stay in parent sporophyte for variable period?

Answer 1

$\huge\mathfrak{Answer:}$

Zygotes do not undergo reduction division immediately. They produce a multicellular body called a sporophyte. The sporophyte is not free-living but attached to the photosynthetic gametophyte and derives nourishment from it. Some cells of the sporophyte undergo reduction division (meiosis) to produce haploid spores.

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Answer 2

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➡In Sporangia, the spore mother cells give rise to spores after meiosis. Spores germinate to form haploid gametophytic structure called prothallus which is free living, small, multicellular and photosynthetic. ... The female gametophytes in these plants are retained on the parent sporophyte for variable period.

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