The primitive streak first appears in which labeled stage of embryonic diagram?
Correct answer: C. C
- A. A
- B. B
- C. C
- D. D
Explanation
The primitive streak is a key structure that forms during early embryonic development and marks the beginning of gastrulation. Stage C in the diagram represents the point where the inner cell mass begins to differentiate and form the bilaminar disc, which is when the primitive streak first appears as a groove in the epiblast layer.
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About Embryonic Development
Embryonic development begins after fertilization with cleavage and formation of the morula and blastula, followed by gastrulation and the establishment of germ layers. It includes organ formation, tissue differentiation and early growth, rather than the later increase in size associated with postnatal development.
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