What happens during fertilisation in humans after many sperms re

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Hysterectomy is surgical removal of 

  • uterus
  • prostate gland

  • vas deference

  • vas deference

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12.

Which of the following is not a sexually transmitted disease?

  • Syphills

  • Acquired Immuno Deficiency Syndrome (AIDS)

  • Trichomoniasis

  • Trichomoniasis

836 Views

13.

Medical Termination of Pregnancy (MTP) is considered safe up to have many weeks of pregnancy?

  • Twelve weeks

  • Eighteen weeks

  • Six weeks

  • Six weeks

947 Views

14.

Which one of the following is the most widely accepted method of contraception in India, as at present?

  • Tubectomy

  • Diaphragms

  • IUDs (Intra Uterine Devices)

  • IUDs (Intra Uterine Devices)

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15.

At which stage of HIV infection does one usually shows symptoms of AIDS?

  • When viral DNA is produced by reverse transcriptase

  • When HIV replicates rapidly in helper T- lymphocytes and damages large number of these

  • With 15 days of sexual contact with an infected person

  • With 15 days of sexual contact with an infected person

424 Views

16.

The technique called gamete intra-fallopian transfer (GIFT) is recommended for those females

  • who cannot produce an ovum

  • who cannot retain  the foetus inside uterus

  • who cervical canal is too narrow to allow passage for the sperms

  • who cervical canal is too narrow to allow passage for the sperms

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17.

What happens during fertilisation in humans after many sperms reach close to the ovum?

  • Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida

  • All sperms excepts the one nearest to the ovum lose their tails

  • Cells of corona radiata trap all the sperms excepts one 

  • Cells of corona radiata trap all the sperms excepts one 


A.

Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida

The process of fusion of a sperm with an ovum is called fertilisation. During fertilization, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that blocks the entry of additional sperms. Thus, it ensures that only one sperm can fertilise an ovum. The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum through the zona pellucida and the plasma membrane.

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18.

About which day in a normal human menstrual cycle does rapid secretion of LH (popularly called LH surge) normally occurs?

  • 14th day

  • 20th day

  • 5th day

  • 5th day

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19.

The permissible use of the technique amniocentesis is for

  • detecting the sex of the unborn foetus

  • artificial insemination

  • transfer of embryo into the uterus of a surrogate mother

  • transfer of embryo into the uterus of a surrogate mother

331 Views

20.

Cu ions released from copper -releasing Intra Uterine Devices (IUDs)

  • make uterus unsuitable for implantation

  • increase phagocytosis of sperms

  • suppress sperm motility 

  • suppress sperm motility 

579 Views

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