How are the embryo and the endosperm formed

When the pollen reaches the ovary, it seeks out an ovule and grows into it, carrying two sperm cells with it. One of the sperm cells unite with the egg cell, forming it in an embryo. The other sperm cell fuses with other parts of the ovule to form an endosperm.

Explanation:

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yes it is   dangerous

explanation:

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both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.