Question

Define Double fertilisation

Answer 1

Double fertilization is a complexfertilization mechanism of flowering plants (angiosperms). This process involves the joining of a female gametophyte (megagametophyte, also called the embryo sac) with two male gametes (sperm).

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Answer 2

Answer:

• Double fertilisation is an event unique to angiosperms.
• After the dispersal from the anthers, pollen grains are carried by wind or various other agencies to the stigma of a pistil.
• The pollen grain germinates on the stigma and the resulting pollen tube grows through the tissues of stigma and style and reach the ovule.
• The pollen tube enters the embryo sac (female gametophyte) and discharge the male gametes present in the pollen grain.
• One of the male gametes fuses with the egg cell to form zygote. This is known as syngamy.
• The other male gamete fuses with the diploid secondary nucleus to produce the triploid primary endosperm nucleus (PEN).
• This primary endosperm nucleus develops into endosperm which nourishes the developing embryo.