Describe the process of double fertilization.
Describe the process of double fertilization.
Double fertilization is observed only in angiosperms. It involves two types of fusions in the embryo sac:
1. Fusion of sperm cell (male gamete) with egg cell (female gamete) to form a diploid zygote. This process is known as syngamy or generative fertilization.
2. Fusion of the other sperm cell with two polar nuclei to form primary endosperm cell containing triploid nucleus also known as primary endosperm nucleus (PEN). This process is known as triple fusion as it involves the fusion of three haploid nuclei. The zygote gradually develops into an embryo and the central cell becomes the primary endosperm cell (PEC) and eventually develops into endosperm.
Double fertilization gives stimulus to other cells of the embryo sac to resume their growth and form nutritive tissue to ensure that the developing embryo gets proper nutrition for the formation of viable seed.
Double fertilization is observed only in angiosperms. It involves two types of fusions in the embryo sac:
1. Fusion of sperm cell (male gamete) with egg cell (female gamete) to form a diploid zygote. This process is known as syngamy or generative fertilization.
2. Fusion of the other sperm cell with two polar nuclei to form primary endosperm cell containing triploid nucleus also known as primary endosperm nucleus (PEN). This process is known as triple fusion as it involves the fusion of three haploid nuclei. The zygote gradually develops into an embryo and the central cell becomes the primary endosperm cell (PEC) and eventually develops into endosperm.
Double fertilization gives stimulus to other cells of the embryo sac to resume their growth and form nutritive tissue to ensure that the developing embryo gets proper nutrition for the formation of viable seed.
