Answer: Option C. -> Grafenberg ring, Lippes loop, Copper-T, Mirena
:
C
The correct order of discovery from oldest to most recent of the IUDS are Grafenberg ring, Lippes loop, Copper-T, Mirena. The German gynecologist, Ernst Grafenberg, was the first to investigate intrauterine contraception on a scientific basis.In 1929 he published his studies of the "Grafenberg ring", the first IUD for which there are usage records. Then came the IUD developed by Jack Lippes, who helped begin the increase of IUD use.His trapezoid shaped Lippes Loop IUD became one of the most popular first-generation IUDs.
The next in the order are thecopper IUDs which were invented in the 1960s and brought with it the capital 'T' shaped design used by most modern IUDs.Finally the hormonal IUD was discovered, one of which is Mirena released in 1976 and is still in use.

Answer: Option A. -> A mixture of sperms and ova into the fallopian tubes
:
A
Gamete intrafallopian transfer (GIFT) is a tool of assisted reproductive technology against infertility. Eggs are removed from a woman's ovaries, and placed in one of the fallopian tubes, along with the man's sperm.

Answer: Option B. -> Treponema pallidum
:
B
Syphilis is caused by a spirochete (a worm-like spiral-shaped bacteria) called Treponema pallidum. You can get the bacteria in the following ways: direct contact with a syphilis sore (usually found on the vagina, anus, rectum, in the mouth, or on the lips) during vaginal, anal, or oral sex with an infected person.
Neisseria gonorrheaecauses gonorrhea disease, which is also an STD.
Pasteurella pestis also known asYersinia pestisis a gramnegative, rod-shapedcoccobacillus, a facultative anaerobic organism that can infect humans via the oriental rat flea.It causes the deadly disease called Bubonic plague.
Clostridium botulinumcauses the botulism disease.

Answer: Option B. -> World Population Day
:
B
World Population day is an annual event, observed on July 11 every year, which seeks to raise awareness of global population issues. The event was established by the Governing Council of the United Nations Development Programme in 1989.

Answer: Option D. -> Both (a) and (b)
:
D
Oral contraceptives contain progesterone that inhibits luteinizing hormone and estrogen that inhibits follicle stimulating hormone. Combined oral contraceptives suppress ovulation and so if there is no egg then there will be no fertilization.

Answer: Option D. -> All of the above
:
D
Main reason for female infertility are ovulatory problems, blockage of fallopian tube and cervical and vaginal infection. Ovulatory problems prevent production of ovum, blockage of fallopian tube prevents the transfer of ovum from the ovary to the uterus. Cervical and vaginal infection may prevent with sexual intercourse.Infections can also cause infertility. Chlamydia is one of the most common sexually transmitted infections that affect female fertility.

Answer: Option D. -> Syphilis
:
D
Syphilis is caused by a spirochete (a worm-like spiral-shaped bacteria) called Treponema pallidum. All the other diseases mentioned are caused by viruses
AIDS is caused by Human Immunodeficiency virus
Hepatitis Is caused by Hepatitis virus
Herpes is caused by herpes simplex virus

Answer: Option B. -> Disturbing the site of implantation
:
B
IUD is a very tiny T-shaped device made of copper coil inserted into the uterine cavity by a doctor or nurse and left there for certain period for the contraception purpose. IUD works by disrupting implantation. The IUD affects the uterine lining (where a fertilized egg implant and grow).

Answer: Option C. -> Genital Herpes - Human Papilloma Virus
:
C
Genital warts is caused bya virus known as the Human Papilloma Virus (HPV). Genital Herpes is caused byHerpes Simplex Virus (HSV).

Answer: Option D. -> 7.4 million
:
D
In demographics, the world population is the total number of humans currently living. As of August 2016 , it was estimated at 7.4 billion. The United Nations estimates it will further increase to 11.2 billion in the year 2100.