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SubjectsBiology
द्वि-निषेचन
In Class 12 Biology, this topic from Chapter 1, “Sexual Reproduction in Flowering Plants,” explains the distinctive fertilisation process in angiosperms. Students learn how the pollen tube delivers two male gametes to the embryo sac: one fuses with the egg to form the diploid zygote (syngamy), while the other fuses with the two polar nuclei to produce the triploid primary endosperm nucleus (triple fusion). The topic also connects double fertilization with embryo and endosperm development and seed formation.
TOPIC PRACTICE
Up to 2 questions from this page. Select your focus, then start.
The governing concept is male gametophyte development and double fertilisation. The generative cell undergoes one mitotic division and produces two haploid male gametes. One later fuses with the egg to form the zygote, and the other fuses with the polar nuclei or central cell to form the primary endosperm nucleus. The vegetative cell forms the pollen tube.
Double fertilization is the defining reproductive feature of angiosperms and consists of two fusion events. One male gamete fuses with the egg to form a diploid zygote, called syngamy. The second fuses with the secondary nucleus, producing the primary endosperm nucleus through triple fusion. The other options describe no normal double-fertilisation event.
QUIZ COMPLETE
