How is secondary nucleus formed? What is the ploidy of primary endosperm nucleus (PEN)?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Secondary nucleus formation: Fusion of two polar nuclei (each haploid) within the embryo sac produces the diploid (2n) secondary nucleus
- Primary Endosperm Nucleus (PEN): Forms through triple fusion—one male gamete (n) fuses with the secondary nucleus (2n), resulting in triploid (3n) PEN
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