Q. Choose the incorrect statement from the following:
  1. In birds and mammal internal fertilisation takes place.
  2. Colostrum contains antibodies and nutrients.
  3. Polyspermy in mammals is prevented by the chemical changes in the egg surface.
  4. In the human female implantation occurs almost seven days after fertilisation.

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Please find below the solution to the asked query 
          
Statement (3) is incorrect.
Polyspermy (fertilization by multiple sperms) is prevented by depolarization of egg membrane. This blocks the entry of additional sperms and ensures that only one sperm fertilize the ovum. 

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