Q.Which one of the following is true to gastrulation ?
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Start your 14-day free trial to unlock the full solution →Gastrulation converts the single-layered blastula into a three-germ-layered gastrula (ectoderm, mesoderm, endoderm).
During early embryonic development, the zygote undergoes cleavage to form a multicellular, single-layered hollow blastula (option b — this is cleavage, not gastrulation). The blastula then undergoes extensive cell movements — invagination, involution, and epiboly — that rearrange its cells into three distinct primary germ layers: outer ectoderm, middle mesoderm, and inner endoderm; this reorganisation is gastrulation, and the resulting embryo is called a gastrula. Option (c), attachment of the blastocyst to the uterine wall, is implantation, which occurs around day 7 after fertilisation, a separate event from gastrulation. O …
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