The enzymes that dissolve the membrane
enveloping the ovum and help sperm to enter the ovum are:

Sperm lysins

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Inhibin

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Both a and b

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Spectrin

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Solution

The correct option is A Sperm lysins
In mammals, the sperm head contains digestive enzymes (including hyaluronidase and acrosin). These enzymes dissolve the membranes surrounding the ovum and thus allow the sperm to enter inside the egg. These are called the sperm lysins.

Inhibin and spectrin are other proteins and are not involved in this process.

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The changes in which layer or membrane of ovum check the entry of additional (more than one) sperms?

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