What is the function of copper ions in copper releasing $IUDs$?
They increase phagocytosis of sperm within the uterus
They suppress sperm motility and the fertilising capacity of sperms
They make the uterus unsuitable for implantation
They inhibit ovulation
Which one of the following is the most widely used method of contraception by females in India?
What is the function of copper $-T$ ?
The scientist who propounded that population is a group of species
Human population after $17$th century $A.D.$ is thought to be in
What percentage of the world population lives in India