Advertisements
Advertisements
Question
List four ways of preventing pregnancy. State two advantages of using such preventive methods.
Advertisements
Solution
Ways of preventing pregnancy:
(i) Natural methods: In this method, sexual act is avoided from day 10th to 17th of the menstrual cycle since during this period ovulation is expected. Therefore, the chances of fertilization are very high.
(ii) Barrier methods: In this method, the fertilization of ovum and sperm is prevented with the help of barriers. Barriers are available for both males and females. Condoms act as barriers. They are made of a thin rubber, which is used to cover the penis and vagina in males and females respectively.
(iii) Oral contraceptives: In this method, tablets or drugs are taken orally. These contain small doses of hormones which prevent the release of eggs and prevent fertilization.
(iv) Implants and surgical methods: Contraceptive devices such as the loop or Copper-T rods are placed in the uterus to prevent pregnancies. However, they can cause side effects in the uterus.
APPEARS IN
RELATED QUESTIONS
What are the three types of methods used for birth control (or regulating child birth)? Give one example of each type.
What is the name of surgical method of birth control in human males in which the sperm ducts are cut and ligated (tied) at both ends?
The sexually transmitted disease which is caused by bacteria is :
(a) malaria
(b) diarrhoea
(c) gonorrhoea
(d) AIDS
A woman uses a device X made of a common metal for preventing pregnancy. This device works by preventing the implantation of fertilised egg cell (or embryo) in the female organ Y.
(a) What are the two names of device X?
(b) Name the organ Y.
(c) Can this method of contraception protect a woman from acquiring a STD?
A, B and C are three common STDs. A and C are caused by bacteria whereas B is caused by a virus D. The virus D reduces the immunity of the infected person to such a low level that the person can die of even very mild diseases.
(a) What could A and C be?
(b) What is B?
(c) Name the virus D?
(d) How can A, B and C be caused?
(e) Out of A, B and C, which one does not have a definite cure as yet?
What is contraception ? List three reasons for adopting contraceptive methods.
Define amniocentesis.
A national level approach to build up a reproductively healthy society was taken up in our country in ______.
A dark stained body present in the somatic cells of human female but absent from those of male is ______.
Explain how, offspring and parents of organisms reproducing sexually have the same number of chromosomes?
