Home
Class 12
BIOLOGY
The entry of only one sperm ensured ...

The entry of only one sperm ensured into an ovum during fertilization in humans, Explain.

Text Solution

Verified by Experts

Reason : A sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of additional sperms .
Promotional Banner

Topper's Solved these Questions

  • REPRODUCTION IN PLANTS AND ANIMALS

    SURA PUBLICATION|Exercise ADDITIONAL QUESTION & ANSWERS ( VERY SHORT ANSWERS ) :|14 Videos

  • REPRODUCTION IN PLANTS AND ANIMALS

    SURA PUBLICATION|Exercise ADDITIONAL QUESTION & ANSWERS ( SHORT ANSWERS ) :|7 Videos

  • REPRODUCTION IN PLANTS AND ANIMALS

    SURA PUBLICATION|Exercise ADDITIONAL QUESTION & ANSWERS ( ANSWER IN A SENTENCE ) :|11 Videos

  • PROBLEMS-4 MARKS

    SURA PUBLICATION|Exercise Subjective Type Questions|20 Videos

  • STRUCTURAL ORGANISATION OF ANIMALS

    SURA PUBLICATION|Exercise ADDITIONAL QUESTIONS & ANSWERS (VALUE BASED QUESTIONS)|2 Videos

Similar Questions

Explore conceptually related problems

Name the enzyme that helps the sperm to penetrate the ovum during fertilisation

________An enzyme that helps the sperm to enter the ovum during fertilization .

Explain the process of fertilization in human beings.

Assertion : Acrosome is a small cup like pointed structure at the tip of the nucleus of sperm, which helps the sperm to pentrate the ovum during fertilization. Reason : Acrosome contains a proteolytic enzyme, hyaluronidase popularly known as sperm lysin which helps to penetrate the ovum during fertilization.

(i) For fertilization to occur, the egg must be transported earlier to the fallopian tube. (ii) Twins are formed because fertilization membrane is formed later. (iii) Binding of sperms to receptor molecules in zona. Pellucida is seen during fertilization (iv) Morula is formed before blastocyst

Read the following paragraph given. Although spermatozoa are said to be 'mature' when they leave the epidi dymis, their activity is checked by multiple inhibitory factors secreted by the genital duct epithelium. Therefore when they are first expelled in the semen, they are unable to perform their duties in fertilizing ovum. Be fore fertilization they have to be activated. a. How and from where the sperm gets activated? b. Give an outline of the remaining process after activation.

Fill up the blanks in the following paragraph by selecting the correct option A. overset("i")("___") methods work on the principle of avoiding chances of ovum and sperms meeting B. overset("ii")("___") is one such method in which the couples avoid coitus from day 10 to 17 of the menstrual cycle C. overset("iii")("___") is another method in which the male partner withdraws his penis from the vagina just before ejaculation so as to avoid insemination D. overset("iv")("___") method is based on the fact that ovulation and therefore the cycle do not occur during the period of intense loctation following parturition.

Fertilization in humans is practically feasible only if :

briefly explain the mechanism of fertilization and implantation in human beings.