Identify the human development 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:

Developmental stage Site of occurrence
1. Blastula End part of fallopian tube
2. Blastocyst Uterine wall
3. 8-celled morula Starting point of fallopian tube
4. Late morula      Middle part of fallopian tube
Subtopic:  Implantation |
 80%
Level 1: 80%+
AIPMT - 2012
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Which extra embryonic membrane in humans prevents desiccation of the embryo inside the uterus?

1. Chorion

2. Allantois

3. Yolk sac

4. Amnion

Subtopic:  Implantation : Part 2 | Embryonic Development till Gastrulation | Implantation |
 55%
Level 3: 35%-60%
AIPMT - 2008
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