Why is the fertilation in case of angiosperm referred to as double fertilisation? give the significance of double fertilisation.
class 12th CBSE Biology sample paper
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Fertilisation in angiospermic flowering plants in known as Double fertilisation because both the male gametes and male gametophyte takes part in sexual fusion.
One fuses with egg to give rise a dipolid zygote while the other male gamete fuses with two polar nuclei (secondary diploid nucleus) to form the triploid primary endosperm nucleus (PEN).
Thus, double fusion occurs in an embryo sac during fertilisation.
Double fertilisation results in formation of triploid endosperm which provide sufficient nutritional food to the developing embryo and seed.
Endosperm helps in the production of healthy seeds.
Thus, triploid endosperm compensates for the extreme reduced female gametophyte of angiosperms.
One fuses with egg to give rise a dipolid zygote while the other male gamete fuses with two polar nuclei (secondary diploid nucleus) to form the triploid primary endosperm nucleus (PEN).
Thus, double fusion occurs in an embryo sac during fertilisation.
Double fertilisation results in formation of triploid endosperm which provide sufficient nutritional food to the developing embryo and seed.
Endosperm helps in the production of healthy seeds.
Thus, triploid endosperm compensates for the extreme reduced female gametophyte of angiosperms.
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Angiosperms, or flowering plants, undergo a unique process called double fertilization. After pollination brings a pollen grain to a flower's female reproductive structure (carpel), a pollen tube releases two sperm cells. ... The second sperm cell fuses with two polar nuclei, creating a triploid endosperm.
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