Question

Which is going to be the future endosperm?

Answer 1

In the given figure, the part marked as B is the secondary polar nuclei. It is diploid in nature. It fuses with the haploid male gamete and forms triploid primary endosperm nucleus (PEN). This undergoes further mitotic divisions to form the nutritive tissue the endosperm. Triploid endosperm is a characteristic feature of angiosperms. In the case of gymnosperms, the endosperm is haploid in nature.