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)


C.

IUDs (Intra Uterine Devices)

At present, the most widely accepted method of contraception in India is IUDs (Intra Uterine Devices). These devices are effective and popular. These devices are inserted by doctors and expert nurses in the uterus through the vagina.

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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


A.

who cannot produce an ovum

The technique called gamete intra-fallopian transfer (GIFT) is a transfer of an ovum collected from a donor into the fallopian tube of another female. This technique is recommended for those females who can not produce an ovum but can provide a suitable environment for fertilisation and further development.

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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


A.

14th day

Rapid secretion of LH leading to its maximum level during the mid- cycle, i.e about the 14th day of menstrual cycle, popularly called LH surge induces rupture of Graafian follicle and thereby the release of ovum (ovulation).

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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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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


C.

With 15 days of sexual contact with an infected person

HIV enters into T -lymphocytes replicates and produces progeny viruses. The progeny viruses released in the blood other helper T-lymphocytes.This is repeated leading to a progressive decrease in the body of the infected person. During this period, the person suffers from bouts of fever, diarrhoea and weight loss. The person starts suffering from an infection.

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