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Reproduction in Lower and Higher Animals — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYReproduction in Lower and Higher Animals5 Marks
Question
Intratuterine devices (IUDs).
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Answer

  1. IUDs are plastic or metal objects which act as contraceptive devices. They are placed into the uterus by a doctor or trained nurse.
  2. E.g. Lippe’s loop, copper releasing IUDs (Cu-T, Cu-7, multiload 375) and hormone releasing IUDs (LNG-20, Progestaert).
  3. Plastic double ‘S’ loop is called Lippe’s loop which stimulates accumulation of macrophages in the uterine cavity by attracting them. As phagocytosis increases the sperms are destroyed. Thus it acts as a contraceptive.
  4. Copper releasing IUDs suppress sperm motility and the fertilizing capacity of sperms.
  5. The hormone releasing IUDs make the : uterus unsuitable for implantation and ; cervix hostile to the sperms.
  6. Their presence in the uterus acts as a minor irritant and thus makes the ovum to move quickly out of the body.
  7. However, IUD can cause infection and occasional haemorrhage. It can cause discomfort for woman and may get spontaneously expelled out.

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