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Explain double fertilization in an angiosperm.
Answers (1)
After entering one of the synergids, the pollen tube releases the two male gametes into the cytoplasm of the synergies. One of the male gametes move towards the egg cell and fuses with its nucleus thus completing the syngamy. 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 form a triploid primary endosperm nucleus (PEN).
As this involves the fusion of these haploid nuclei it is termed as triple fusion.
Since two types of fusions, syngamy and triple fusion take place in an embryo sac, the phenomenon is double fertilization, an event unique to flowering plants.
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