Fertilization - Advance

Dear Readers,

Fertilization is the fusion of haploid gametes, egg and sperm, to form the diploid zygote. Note though there can be subtle differences in the fertilization process which occurs naturally within the body or through reproductive technologies outside the body, the overall product in both cases is a diplod zygote

Q1. Conjoint twins are those which

  •  Develop from same zygote
  •  Develop from two different zygotes
  •  Are wholly or partly fused
  •  Are fused by placenta

Develop from two different zygotes

Q2. Which statement is correct for fertilization

  •  Restore euploidy
  •  Brings male & female gametes together
  •  Entry of whole sperm in egg
  •  All of these

All of these

Q3. Who demonstrated the acrosome reaction in Saccoglossus

  •  F.R. Lillie (1919)
  •  Colwin and Colwin (1967)
  •  Both (a) and (b)
  •  None of the above

Colwin and Colwin (1967)

Q4. Cortical granules on swelling and exploding release

  •  Lamellar and folded parts
  •  Globules
  •  Liquid material
  •  All the above

All the above

Q5. Cortical granules are absent in

  •  Bony fishes
  •  Frog
  •  Mammals
  •  Rat and guinea pig

Rat and guinea pig

Q6. Sperm nucleus follows which path for fertilization

  •  Sperm path
  •  Copulation path
  •  Both (a) and (b)
  •  None of the above

Copulation path

Q7. Which of the following statement is not correct

  •  Fertilizin of one species of animal will react with antifertilizin of another species
  •  Fertilizin of one species of animal will react with antifertilizin of the same species
  •  Fertilizin is a glycoprotein and antifertilizins are acidic proteins
  •  Molecular weight of fertilizin is about 3, 00, 000 and antifertilizin 10,000

Fertilizin of one species of animal will react with antifertilizin of another species

Q8. The plasma membrane of oocyte and that of follicle cells show close connections at some points in the form of

  •  Microvilli
  •  Desmosomes
  •  Cytoplasmic processes
  •  None of the above


Q9. Function of gynogamone-I is

  •  Conserves sperm activity
  •  Dissolves vitelline membrane
  •  Neutralizes androgamone-I thereby increasing sperm activity
  •  Makes sperm head sticky to facilitate attachment of sperm to egg surface

Neutralizes androgamone-I thereby increasing sperm activity

Q10. Sperm of animal species a cannot fertilize ovum of species b because

  •  Fertilizin of a and b are not compatible
  •  Antifertizin of a and b are not compatible
  •  Fertilizin of a and antifertilizin of b are not compatible
  •  Antifertilizin of a and fertilizin of b are not compatible

Antifertilizin of a and fertilizin of b are not compatible

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Fertilization - Advance
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