what is double fertilisation?
Answers
Answered by
11
Double fertilization is a complex fertilization mechanism of flowering plants. This process involves the joining of a female gametophyte with two male gametes. It begins when a pollen grain adheres to the stigma of the carpel, the female reproductive structure of a flower
Answered by
17
Heya !!!
✴ Double Fertilization is a characteristic feature of Angiosperms.
✴Two fusion processes of fusing of one male gamete with egg cell and fusing of second male gamete with secondary nucleus (fusion of Polar nuclei of central cell) is called DOUBLE FERTILIZATION.
▶Two male gametes are discharged into the embryo sac by bursting of the pollen tube.
▶One of the male gametes moves towards moves towards the egg cell and the nucleus of the male gamete fuses with it's nucleus thus completing the syngamy or Fertilization.
▶This results in the formation of a diploid cell the zygote.
▶The other male gamete moves towards the two polar nuclei located in the central cell and fuses with them to produce a triploid Primary endosperm nucleus (PEN).
▶As this involves the fusion of three haploid nuclei, it is termed as Triple Fusion.
▶ Since, two types of Fusions , Syngamy and Triple Fusion , take place in an embryosac , the phenomenon is termed as DOUBLE FERTILISATION.
▶It is an event unique to Flowering Plants.
✴ Double Fertilization is a characteristic feature of Angiosperms.
✴Two fusion processes of fusing of one male gamete with egg cell and fusing of second male gamete with secondary nucleus (fusion of Polar nuclei of central cell) is called DOUBLE FERTILIZATION.
▶Two male gametes are discharged into the embryo sac by bursting of the pollen tube.
▶One of the male gametes moves towards moves towards the egg cell and the nucleus of the male gamete fuses with it's nucleus thus completing the syngamy or Fertilization.
▶This results in the formation of a diploid cell the zygote.
▶The other male gamete moves towards the two polar nuclei located in the central cell and fuses with them to produce a triploid Primary endosperm nucleus (PEN).
▶As this involves the fusion of three haploid nuclei, it is termed as Triple Fusion.
▶ Since, two types of Fusions , Syngamy and Triple Fusion , take place in an embryosac , the phenomenon is termed as DOUBLE FERTILISATION.
▶It is an event unique to Flowering Plants.
Similar questions