An embryo with about 64-cells and a cavity called blastocoel is known as blastocyst. It is composed of an outer envelope of cells the trophoblast. Implantation is attachment of blastocyst to the uterine wall. This occurs 7-days after fertilization. It develops from 8-celled morula to 16-celled morula and then 64-celled stage. The blastocyst sinks into a pit formed in the endometrium and gets completely burried in the endometrium.
NEET UG 2012 — Zoology Human Reproduction
2012mcqmedium
Identify the human developmental stage shown below as well as the related right place of its occurrence in a normal pregnant woman and select the right option for the two together 
Official previous-year question
Held on 30 Apr 2012 · Verified 9 Jul 2026.
Options
- A
(a)
- B
(b)
- C
(c)
- D
(d)
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NEET UG Human Reproduction in other years
More NEET UG Human Reproduction questions
Twins are born to a family that lives next door to you. The twins are a boy and a girl. Which of the following must be true?
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Other Zoology topics for NEET UG
Keep practicing Human Reproduction
Work through every NEET UG Human Reproduction PYQ, year by year.