Practice question

Triploblastic organization involves three germ layers ectoderm, mesoderm and endoderm generated through gastrulation movements of invagination, involution or delamination establishing archenteron and mesenchymal populations. Ectoderm forms epidermis and nervous system, endoderm gut lining and associated glands, mesoderm muscles, connective tissues, blood, kidney and peritoneal coelomic lining. All Bilateria from flatworms to chordates are triploblastic, permitting organ system elaboration, increased size and active burrowing or swimming. Diploblasts have only two layers, four layers never occur in metazoan development. This concept holds high importance for NEET, CBSE board, CUET and competitive examinations focusing on comparative morphology and