NEET BIOLOGY

Detailed explanation-1: -Diploblastic animals have two cell layers and they are outer ectoderm and inner endoderm . These animals don’t have the mesoderm whereas they have middle mesoglea which is an undifferentiated layer. Mesoglea is a jelly-like tissue present in between the ectoderm and endoderm layer.

Detailed explanation-2: -Now, mesoderm is a germ layer that is only found in triploblastic organisms. This germ layer gives rise to the bones, connective tissue, skeleton muscles, heart, and the urogenital system. This germ layer is not found in diploblastic organisms therefore, they are unicellular in nature.

Detailed explanation-3: -During embryogenesis, diploblasts develop two embryonic germ layers: an ectoderm and an endoderm. Triploblasts develop a third layer-the mesoderm-between the endoderm and ectoderm.

Detailed explanation-4: -mesoderm, the middle of the three germ layers, or masses of cells (lying between the ectoderm and endoderm), which appears early in the development of an animal embryo.

Detailed explanation-5: -The phylum Cnidaria (sea anemones, corals, hydras and jellyfish) is the likely sister group of the triploblastic Bilateria. Cnidarians are generally regarded as diploblastic animals, possessing endoderm and ectoderm, but lacking mesoderm.