Correct Option
The correct option is (c) 1 and 3 only.
Explanation
The term "Test-tube baby" refers to the technique of In Vitro Fertilization (IVF). This is an assisted reproductive technology (ART) used to treat infertility, where fertilization occurs outside the female body in a controlled laboratory environment, followed by the transfer of the embryo into the uterus for development.
Statement-wise Analysis
- Statement 1 is Correct: In this procedure, ova from the female and sperm from the male are collected and induced to form a zygote under simulated conditions in a laboratory. Since the fusion of gametes takes place outside the body, it is termed in vitro fertilization.
- Statement 2 is Incorrect: The term "test-tube baby" is a misnomer implying the fetus grows in a laboratory vessel. In reality, only the fertilization and initial cell division occur in the laboratory. The embryo is transferred into the mother's uterus, where the complete gestation and development of the baby take place naturally.
- Statement 3 is Correct: After fertilization, the zygote is allowed to divide and develop in the culture medium for a short period (typically 2 to 6 days, often reaching the blastocyst stage). Once it reaches the appropriate stage of development, the embryo is transferred into the female uterus (Intra-Uterine Transfer) or fallopian tube (Zygote Intra-Fallopian Transfer) to establish pregnancy.
Key Takeaway
In Vitro Fertilization (IVF) involves external fertilization (in a laboratory) but internal development (in the uterus). The baby does not develop in a test tube.