Which one of the following structures is haploid in its ploidy level?
Primary Endospore Nucleus
Microspore Mother cell
Protonemal cell of a moss
Primary endosperm nucleus in dicot
the protonema is the first stage of the gametophyte in mosses, developing directly from a haploid spore; thus, its cells are haploid . In contrast, the Microspore Mother Cell is diploid and undergoes meiosis to form microspores . The Primary Endosperm Nucleus (PEN) in angiosperms is formed by triple fusion (fusion of a male gamete with two polar nuclei), making it triploid .
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