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.
Last updated
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.
Practise Growth and Development
230 free Growth and Development MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Biology questions like this
Biology is on 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
If the fate of each blastomere is foretold then what will that cleavage be?
In animals, a reproductive system developed from:
In most triploblastic after embryonic development, the three layers are represented as?
Spiral and determinate cleavage is found in the embryo of:
In spermatophytes (seeded plants), the ploidy of embryo and the generation in which the embryo is produced is: