Question

Give reason - Zona pellucida is retained after fertilization.
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Answer 1

Answer:

Explanation:when object is at centre of curvature in concave mirror

Answer 2

Explanation:

Explanation: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.