Question

In a female, after how much time after fertilization does the fertilized egg gets implanted in the uterus wall?

• A. Few months
• B. One month
• C. Three weeks
• D. About seven days

Answer 1

The correct option is D About seven days

On the sixth day following fertilisation, the blastocyst gets attached to the uterine wall and the side containing the inner cell mass is positioned against the endometrium. The trophoblast cells produce enzymes that help the blastocyst to 'eat its way' into the thick endometrium. This initiates the process of implantation. By the seventh to tenth day following implantation, the blastocyst is completely embedded or implanted in the endometrium.

So, the correct answer is 'About seven days'.