Question

Correct sequence of embryonic developmental stages:

• A. A, B, C, D and E
• B. D, A, C, E and B
• C. D, A, E, C and B
• D. D, C, A, E and B

Hint:

Mnemonic: “My Big Giant Nose” for Morula $\to$ Blastula $\to$ Gastrula $\to$ Neurula.

Answer 1

The Correct Option is D

Step 1: Concept
Embryonic development follows a conserved sequential series of morphological changes following fertilisation. Step 2--3: Analysis
Development begins with the fertilised egg (D), cleavage forms the morula (C), which becomes the blastula (A). Gastrulation forms germ layers (E), followed by the neurula (B).

Step 4: Conclusion
The sequence is Egg $\to$ Morula $\to$ Blastula $\to$ Gastrula $\to$ Neurula.

Final Answer: (D)