double fertilization

• Double fertilization is observed in angiosperms.
• Archegonia is the female reproductive part located near the notch which gives rise to eggs.
• Antheridia is the sperm which fuses with the archegonia.
• The fusion of egg and sperm results in a diploid fertilized egg, the zygote.
• Another fusion happens, between the second male gamete with the polar nuclei which results in a triploid (3n) primary endosperm nucleus.
• The primary endosperm nucleus becomes the endosperm tissue, which is the main source of food for the embryo.
• Meiosis occurs in anther and ovules.
• In anther, meiosis occurs in microsporocytes to form microspores.
• In ovules, meiosis occurs in megasporocytes to produce megaspores.