The sperm penetrates the ovum mainly

Mechanically

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Chemically

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Electrostatically

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Thermally

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Solution

The correct option is B Chemically
When the sperm comes in contact with the ovum, the acrosomal reaction takes place whereby the sperm releases the enzyme, hyaluronidase and acrosin, which begins to dissolve the actin filaments. As the enzymes are involved, the penetration is chemical in nature.

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