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Assertion : Presence of zona pallucida o...

Assertion : Presence of zona pallucida over the fertilized ovum prevents ectopic pregnancy .
Reason : Zona pellucida helps the ovum to penetrate endometrium .

A

A

B

B

C

C

D

D

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The correct Answer is:
C
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How does zona pellucida of ovum help in preventing polyspermy?

A cellular layer made up of glycoproteins within Graafian follicle around ovum prevents ectopic pregnancy is

Read the following text and answer the following questions on the basis of the same: During sexual reproduction, the male inserts the sperm into the female reproductive tract, and sperm receive by the ovary and after that sperm fuse with the egg (ovum) in the ampullary region, this process is called fertilization, haploid nucleus of sperm fuse with that of ovum to form Diploid zygote. Assertion (A): All copulations do not lead to the fertilisation and pregnancy. Reason (R): Fertilisation can occur only if the ovum and sperms are transported simultaneously to the ampulllary-isthmic junction.

Assertion: Only one sperm can fertilise an ovum. Reason: During fertilisation, a sperm comes in contact with zona pellucida layer of the ovum and induces changes in the membrane that blocks the entry of additional sperms.

Assertion: All copulations do not lead to the fertilisation and pregnance. Reason: Fertilisation can occur only if the ovum and sperms are transported simultaneously to the ampullary isthmic junction.

Assertion: All copulations cannot lead to fertilisation and pregnancy. Reason: Fertilisation can only occur if the ovum and sperms are transported simulaneously to the ampullary region.

Assertion : In barrier methods, ovum and sperms are prevented from physical meetings Reason : Barrier methods are used during coitus, to prevent the entry of ejaculated semen into the female reproductive tract.

Assertion : Zona pellucida is glycoproteinous in nature and dissolved during the event of implantation . Reason : The blastocyst , along with zona pellucida enters in decidua of uterus to protect itself from uterine acidic medium .

MOTION-HUMAN REPRODUCTION -EXERCISE - 4 AIIMS - ASSERTION & REASON QUESTIONS (AIIMS - 2015)
  1. Assertion : The level of FSH & LH attain a peak level in the middle of...

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  2. Assertion : Regular cyclic menstruation is an indicator of normal repr...

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  3. Assertion : The acrosomal secretions of sperm , help it in entering in...

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  4. Assertion : The nucleus of sperm fuses with the nucleus of ovum , befo...

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  5. Assertion : Females not participate in the determination of the sex of...

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  6. Assertion : hCG , hPL and relaxin are produced in women only during pr...

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  7. Assertion : If fertilization dies not occur than the corpus luteum beg...

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  8. Assertion : The mammary glands of the female starts producing milk jus...

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  9. Assertion : All Eutherian are placental mammals . Reason : All place...

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  10. Assertion : Primary spermatocytes of testes are haploid . Reason : P...

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  11. Assertion : Estrogen level is high during the follicular phase of mens...

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  12. Assertion : Normally monospermy occurs in most of animals . Reason :...

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  13. Assertion : Nucleocytoplasmic ratio decreases in cleavage . Reason :...

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  14. Assertion : Egg of eutherian is multicellular . Reason : Many follic...

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  15. Assertion : Presence of zona pallucida over the fertilized ovum preven...

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  16. Assertion : Cleavage in human zygote is holoblastic . Reason : Its e...

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  17. Assertion : During oogenesis polar bodies are formed . Reason : Prim...

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  18. Assertion : In male , urethra is considered as urinogenital duct . R...

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  19. Assertion : When sperm enters in egg , one polar body is released in h...

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  20. Assertion : Distal centriole acts as a basal granule . Reason : Dist...

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