Question

How does the process of fertilization take place in flowers ?

Answer 1

Process of fertilization in flowers:

• Pollination is transfer and deposition of pollen grains on stigma.
• Pollen grain germinates on the stigma. It gives rise to pollen tube which carries male gametes.
• A hypodermal cell of the nucleus in ovule enlarges and forms megaspore mother cell,
• The diploid mega-spore mother cell undergoes meiosis to form four mega-spores.
• The functional mega-spore enlarges into embryo sac.
• The process of nuclear fusion (syngamy) of the male nucleus and one egg nucleus is termed as fertilization. It forms diploid zygote. Second male gamete fuses with secondary nucleus to form primary endosperm nucleus.
• Angiosperms exhibit double fertilization.
• Fall of the petals, stamens, style and stigma.
• The ovules develop into seeds.