Question

What is the difference between self pollination and cross pollination describe with double fertilisation?

Answer 1

Cross pollination - When the pollen grains from the anther of a flower on one plant transferred to the stigma of a flower to the another plant.
Self pollination - When the pollen grains from the anther of a flower transferred to the stigma of the flower (or another flowers to similar plant.)
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Answer 2

Self-pollination is the process of transferring the pollen from the anther to the stigma in the same flower. Cross pollination is the transfer of pollen grains from the anther of a flower to the stigma of another flower in a different plant of the same or different species.

Double fertilisation is the process in angiosperms (flowering plants) during

reproduction, in which two sperm nuclei from each pollen tube fertilise two cells in an ovary. The pollen grain adheres to the stigma of the carpel (female reproductive structure) and grows a pollen tube which penetrates the ovum through a tiny pore called a micropyle. Two sperm cells are released into the ovary through this tube. One of the two sperm cells fertilises the egg cell (at the bottom of the ovule near the micropyle), forming a diploid (2n) zygote. The other sperm cell fuses with two

haploid polar nuclei (contained in the central cell) in the centre of the embryo sac (or ovule). The resulting cell is the triploid (3n) primary endosperm nucleus. This triploid cell divides through mitosis and forms the endosperm, a nutrient-rich tissue, inside the seed.