what is double fertilization?
Answers
Double fertilization is said when in the ovule both Egg and The polar nuclei fertilizes at the same time thus causing triple fusion.
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Double Fertilization:
After entering one of the synergids, pollen tube releases two male gametes into the synergid.
One of the male gametes fuses with egg nucleus, the process is called syngamy.
This results in formation of diploid zygote.
The other gametes move towards the central cell and fuses with its two nuclei to form triploid primary endosperm nucleus (PEN).
As this involves fusion of three haploid nuclei, it is called triple fusion.
Since 2 types of fusion (syngamy and triple fusion) takes place in an embryo sac, the phenomenon is called double fertilization, an event unique to flowering plants.
The central cell after triple fusion becomes primary endosperm cell (PEC) which develops into endosperm.
While the zygote develops into embryo.
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