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Question

Fertilizin is a chemical substance produced from

A
Polar bodies
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B
Middle piece of sperm
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C
Mature eggs
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D
Acrosome
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Solution

The correct option is C Mature eggs
Egg (ovum) secretes a chemical named fertilizin (composed of glycoprotein = monosaccharides + amino acids). Sperm has on its surface a protein substance called antifertilizin (composed of acidic amino acids). The fertilizin of an egg interacts with the antifertilizin of a sperm of the same species. This interaction makes the sperm adhere to the egg surface. The adhesion of sperm to the egg of the same species through chemical recognition is known as agglutination.

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