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In the plant “alternation of generations" diagram, where does a seed fit into that diagram?

In the plant “alternation of generations" diagram, where does a seed fit into that diagram?

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An egg, in the archegonium, fuses with a sperm, released from an antheridium. The resulting zygote is either male or female A malezygote develops by mitosis into a microsporophyte, which at maturity produces one or more microsporangia. Microspores develop within the microsporangium by meiosis.In all seed plants the zygote first develops into an embryo microsporophyte within the ovule (a megasporangium enclosed in one or more protective layers of tissue known as integument). At maturity, these structures become the Seed...

So thats the position of seed in Alternation of generation diagram.

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