Question

Assertion: Periodic abstinence is a method in which couples avoid from coitus from day 17 to 27 of the menstrual cycle.
Reason: Periodic abstinence is a very effective method and 100% sure of birth control.
(a)Both assertion and Reason are correct and the reason is the correct explanation for assertion
(b)Both assertion and reason are correct but the reason is not the correct explanation for assertion
(c)Assertion is correct but the reason is incorrect
(d)Both assertion and reason are incorrect

Answer 1

Ovulation starts after the 10th day of the menstrual cycle and it takes 7 days to develop ova. This phase is called the fertile phase. In some people there will be disturbances in the menstrual cycle and ovulation may not start exactly after the 10th day.

Complete answer:
Depending on the principle of avoiding chances for sperm meeting the ovum natural methods are of three types. Period abstinence, withdrawal or coitus interruptus, and lactational amenorrhea.
In period abstinence, couples avoid coitus from the 10th day to the 17th day of the menstrual cycle. This is called the fertile period when ovulation occurs.

Additional Information:
- Intentional prevention of fertilization of an egg by sperm at the beginning of pregnancy by artificial or natural means is called contraction.
- The devices which prevent or interfere with ovulation, fertilization, and implantation are called contraceptives.
- Many contraceptive methods available currently which are classified as natural methods, barriers, intrauterine devices, oral contraceptive pills, injectables, implants, vaginal rings, skin patches, and surgical methods.
- Natural methods or traditional methods are the safest methods without any side-effects but they cannot be 100% effective methods. There is a chance of fertilization because in some people there are abnormalities in the menstrual cycle and ovulation may not start on the 10th day and the fertile period may change. If the couple participates in coitus there is a chance of fertilization.
- Imbalance in the menstrual cycle may be due to hormonal changes
So, the correct answer is 'both assertion and reason are incorrect".

Note: Contraceptives used in various artificial methods are condoms, cervical caps, spermicidal creams, jellies, intrauterine devices like copper T, progestasert, LNG-20, contraceptive cells, vaginal ring, and skin patch, etc.