List three techniques that have been developed to prevent pregnancy. Which one of these techniques is not meant for males? How does the use of these techniques have a direct impact on the health and prosperity of a family?

Explanation

Three techniques - Barrier method, chemical method, surgical method Chemical method It maintains health of the woman, parents can provide more attention to children/more resources are available to the family/ any other.
Detailed Answer :
Three techniques that have been developed to prevent pregnancy are :
(i) Barrier method : Physical methods such as condom, diaphragm and cervical caps are used to prevent entry of sperms in females.
(ii) Chemical methods : Drugs such as oral pills and vaginal pills are used by females.
(ill) Surgical methods such as vasectomy in males and tubectomy in females.
Chemical techniques are not meant for males. The use of these techniques helps in controlling population explosion thus providing better living conditions.
It helps in keeping proper gap between siblings thus gives better health to mother as well as children.