Answer:
\[C{{a}^{2+}}\] along with magnesium plays an important role in acrosomal reaction. The capacitated sperms undergo acrosomal reaction to release sperm lysins, which help in the activation of oocyte. These are · Hyaluronidase It acts on ground substance of follicle cells. · Corona penetrating enzyme It dissolves corona radiata. · Zona lysin It digests the zona pellucida. These sperm lysins thus facilitate fusion of male and female gamete, i.e. fertilisation forming a zygote.
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