Question

The first germinal layer formed in human embryo is ______________.

• A. mesoderm
• B. trophectoderm
• C. ectoderm
• D. endoderm

Hint:

Order of germ layer formation: Endoderm → Mesoderm → Ectoderm.

Answer 1

The Correct Option is D

Step 1: Understanding germ layers.
During early embryonic development, cells differentiate into three primary germ layers: endoderm, mesoderm, and ectoderm.
Step 2: Sequence of formation.
The endoderm is the first germinal layer to be formed during gastrulation in human embryos.
Step 3: Role of endoderm.
Endoderm gives rise to the lining of the digestive tract, respiratory tract, and associated organs.
Step 4: Conclusion.
Hence, the first germinal layer formed is endoderm.