Question

how is the act of fertilisation carried out in angiosperms.Explain

Answer 1

Pollen tube enter the embryo sac of ovule with two male gametes. One male gamete fuses with egg cell to form a zygote and other fuses with the diploid secondary nucleus (formed by the fusion of two polar nuclei) as a result triploid primary endosperm nucleus (PEN) is formed. As there is two types of fusion takes place inside ovule of angiosperm so this is called as double fertilization. 

PLZ MARK ME AS BRAINLIEST

Answer 2

Explanation:

Out of two male gametes released from the pollen tube, one fuses with the egg cell. This act is called fertilization. In angiosperms, this is necessarily followed by fusion of the second male gamete with the product of a fusion of two polar nuclei i.e. with the secondary nucleus. This is called triple fusion and thus both the male gametes participate in the act of fertilization. This is called double fertilization and is a unique feature of Angiosperms. After a successful act of fertilization and double fertilization, each ovule is transformed into the seed.