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प्रश्न
Why is zona pellucid retained around the egg till it reaches the uterus?
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उत्तर
Zona pellucida prevents the implantation of the blastocyst at an abnormal site such as a fallopian tube and it keeps trophoblast cells unexposed till it reaches the uterus. Hence, zona pellucida is retained around the egg until it reaches the uterus.
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