Home
Class 12
BIOLOGY
How does a sperm penetrate through the z...

How does a sperm penetrate through the zona pellusida in human ovum?

Text Solution

AI Generated Solution

**Step-by-Step Solution:** 1. **Understanding the Zona Pellucida**: The zona pellucida is a glycoprotein layer surrounding the human ovum (egg). It plays a crucial role in fertilization by acting as a barrier that sperm must penetrate to reach the egg. 2. **Sperm Activation**: When sperm reaches the ovum, it undergoes a process called capacitation, which prepares the sperm for fertilization. This process enhances the sperm's ability to penetrate the zona pellucida. 3. **Acrosome Reaction**: Upon contact with the zona pellucida, the sperm undergoes the acrosome reaction. The acrosome is a cap-like structure that contains enzymes necessary for penetrating the zona pellucida. ...
Promotional Banner

Topper's Solved these Questions

  • HUMAN REPRODUCTION

    ICSE|Exercise PRACTICE QUESTIONS (SHORT ANSWER TYPE-I QUESTIONS)|17 Videos

  • HUMAN REPRODUCTION

    ICSE|Exercise PRACTICE QUESTIONS (SHORT ANSWER TYPE-II QUESTIONS)|20 Videos

  • HUMAN REPRODUCTION

    ICSE|Exercise SOURCE BASED QUESTIONS|22 Videos

  • HUMAN HEALTH AND DISEASE

    ICSE|Exercise COMPETITION CORNER (OBJECTIVE TYPE QUESTIONS) (Assertion and Reason Type Questions (For AIIMS aspirants))|28 Videos

  • ISC BOARD PAPER (2019 -BIOLOGY)

    ICSE|Exercise PART-II ( SECTION-C)|12 Videos

Similar Questions

Explore conceptually related problems

An unfertilized human ovum has

Fill up the blanks in the following paragraph by selecting the correct option. During copulation (coitus) semen is released by the penis into the vagina and is called (i)._____.the ovum released by the ovary is transported to the (ii)._____where (iii).______takes place during fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of (iv)._____The secretions of the (v)._____help the sperm enter into the cytoplasm of the ovum.

The process of sperm penetrating the ovum is mainly

How does water flow through a sponge?

Name the enzyme which a sperm releases to penetrate the layer of corona radiata of an ovum.

Assertion : X - rays can penetrate through the flesh but not through the bones. Reason : The penetrating power of X - rays depends on voltage.

Which organelle is absent in human sperm?

How does the sperm reach up to the egg and how does it enter into the egg?

Draw a labelled diagram of human ovum.

which of the followin enzyme helps sperm to penetrate zone pellucida ?

ICSE-HUMAN REPRODUCTION-PRACTICE QUESTIONS (VERY SHORT ANSWER TYPE QUESTIONS)
  1. Which germ layer forms CNS?

    Text Solution

    |

  2. Which germ layer forms the skeleton and muscles?

    Text Solution

    |

  3. What is the function of sperm lysins?

    Text Solution

    |

  4. Where does the foetus develop in the female genital tract?

    Text Solution

    |

  5. How does a sperm penetrate through the zona pellusida in human ovum?

    Text Solution

    |

  6. What are Leydig's cells?

    Text Solution

    |

  7. What term is used for the chemicals which occur in sperm's acrosome an...

    Text Solution

    |

  8. What does the blastocoel of mammalian embryo phylogenetically signify ...

    Text Solution

    |

  9. Define spermatogenesis.

    Text Solution

    |

  10. Name the layer of cells which forms the outer wall of blastocoel.

    Text Solution

    |

  11. What is the special structural feature of the epithelial cells that li...

    Text Solution

    |

  12. Which germ layers produce nervous system and kidneys?

    Text Solution

    |

  13. Write one difference between blastos and a gamete.

    Text Solution

    |

  14. Placenta acts as an endocrine tissue. Justify.

    Text Solution

    |

  15. At which stage of life is oogenesis initiated in human female? When do...

    Text Solution

    |

  16. Name the various extraembryonic membranes.

    Text Solution

    |

  17. Which cell organelle is modified to form the acrosome? Name the chemic...

    Text Solution

    |

  18. Differentiate between menarche and menopause

    Text Solution

    |

  19. Where does fertilisation normally take place in a human female?

    Text Solution

    |

  20. At what stage is mammalian embryo implanted in the uterus?

    Text Solution

    |