The attachment of the embryo to the wall of the uterus is called

1. Analyze the question The question asks for the name of the process in which the embryo attaches to the uterine wall. This happens early in pregnancy, after fertilization.

2. Explain the concept After fertilization in the fallopian tube (oviduct), the zygote divides repeatedly as it travels toward the uterus. It becomes a ball of cells called a blastocyst. About 6-10 days after fertilization, the blastocyst sticks to the endometrium (the lining of the uterus) and embeds itself in it. This is called implantation.

3. Go through the options

• A. Ovulation: the release of a mature ovum from the ovary. It happens before fertilization, so this is wrong.
• B. Implantation: the attachment and embedding of the embryo in the uterine wall. This matches the question.
• C. Gametogenesis: the formation of gametes (sperm and egg) by meiosis. It has nothing to do with the embryo, so this is wrong.
• D. Placentation: the formation and development of the placenta. It follows implantation and is a separate process, so this is wrong. The placenta is the organ that exchanges nutrients, oxygen and wastes between mother and foetus.

4. Answer The correct option is B. Implantation.

5. Exam tip Remember the order of events in reproduction with this sequence: Gametogenesis → Ovulation → Fertilization → Implantation → Placentation. "Implant" works like planting something in soil. The embryo is "planted" in the uterine wall.