Q.108
The developmental stage in which the early embryo consists of an open mouthed sac-like body with a wall of two layer of
cells is called as
- Stages of Nematode Embryonic Development:
- Gastrulation Stage: During nematode embryogenesis following the hollow blastula stage, the two primary endodermal precursor cells ($E$ blastomeres) invaginate into the blastocoel, followed by mesodermal and germline cells.
- Anatomical Configuration: This creates a classic gastrula consisting of an open-mouthed, cup- or sac-like two-layered embryonic body (outer ectoderm and inner endomesoderm) surrounding the blastopore.
- Conclusion: The stage is called the Gastrula (Option 4).
Correct option: (4) Gastrula
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