In flowering plants, the triploid tissue formed after double fertilisation is the

In double fertilisation, one male gamete fuses with the egg to form the diploid zygote, and the other fuses with the two polar nuclei to form the triploid primary endosperm nucleus, which develops into the endosperm that nourishes the embryo. The zygote and embryo are diploid, and the seed coat comes from the integuments.