Describe three manners in which fertilisation of human ovum by a sperm can be prevented.
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▪ Class 12th.
Answers
1.copper T wire.
2.condoms or cervical caps.
3.spermicides.
4.pulling out of penis before ejection.
Some of the contraceptive methods by which fertilisation of ovum by sperm can be prevented are:
Barrier method → In this method, the fertilization of ovum and sperm is prevented with the help of barriers. Condoms are barriers that prevent pregnancy.
Oral contraceptives → These are taken orally. They contain hormones—either progesterone or progesterone−oestrogen combination and prevent the release of eggs and thus fertilisation.
Intra uterine devices (IUDs) : They release hormones to cause phagocytosis of sperms or they release copper ions to decrease sperm motility.
Surgical methods : Include vasectomy (removal of a part of the vas deferens in males) and tubectomy (removal of a part of the fallopian tubes in females).
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