Question

Test tube baby means a baby born when
a) It develops from a non-fertilised egg
b) It develops in a test tube
c) It is developed through a tissue culture method
d) The ovum is fertilised externally and then implanted in the uterus.

Answer 1

Hint:Test tube baby is a baby that gets developed from an egg that is fertilized outside the body in a controlled circumstance. An egg gets fertilised with sperms inside the fallopian tubes. Later the fertilized egg moves to the uterus and gets implanted to the uterine lining.

Complete answer:
When a child gets conceived outside a woman’s body, it is termed as Test tube baby. Test tube babies are conceived in a laboratory through a process called in-vitro fertilisation. This is popularly known as the IVF method. In this process, the egg is fertilised and then implanted inside the uterus of the biological or surrogate mother. The embryo does not develop into a fetus in the lab. Initially, the woman takes fertility drugs, to stimulate the development of eggs in the ovaries. After a few days, the mature eggs are removed from the ovaries. The retrieved eggs are combined with sperm in the lab. A petri dish is used to combine the sperm and egg. Though the name is used as test-tube babies, they are not developed in a test tube. Test tubes are not part of the IVF process. The sperm cell and egg cell fertilize in a petri dish. A fertilized human egg cell is called an embryo. After protecting embryos for a few more days in the lab, they are transferred to the mother’s uterus.

Hence the correct answer is option ‘D’.

Note: The phrase in vitro is "within the glass.” It refers to anything that occurs in a laboratory environment. This is the opposite of the term in vivo. This means within the body.