Answer :
After fertilization, the zona pellucida acts as a barrier to further sperm.
What is Zona pellucida?
All mammalian oocytes, eggs, and preimplantation embryos—from monotremes that lay eggs to placental mammals—are surrounded by the zona pellucida (ZP), a relatively thick extracellular matrix (ECM).
Species-specific binding of sperm to unfertilized eggs, stimulating sperm to go through acrosomal exocytosis, and preventing sperm from binding to fertilized eggs are all caused by zona pellucida glycoproteins.
The zona pellucida surrounds the ovum and the embryo from the time of ovulation until their passage into the uterine cavity.
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