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Fertilisation is a process in which male gamete fuses female gamete.in this ovum is female gamete .it occurs in that time so that the worm or uterus prepare itself to contain zygote
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it is because for fertilization it is necessary for a ovum to be in the ampullary-isthmic region(about in between fallopian tube) and in the mid menstrual cycle ovum is present there.fertilisation can only occur if the ovum & sperm are transported simultaneously to the ampullary-isthmic junction. 
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