Classifying Animals by Body Features — NEET Biology
📚 Practice ConceptThe basic fundamental features such as level of organisation, symmetry, body organisation, organ system, coelom, segmentation, notochord, etc. have enabled us to broadly classify the animal kingdom. Besides the fundamental features, there are many other distinctive characters which are specific for each phyla or class.
Which of the following statements correctly describes the fundamental features of animal classification? S1. In diploblastic animals, an undifferentiated layer called mesoglea is present between the ectoderm and endoderm, as seen in Coelenterates. S2. Platyhelminthes exhibit organ level of organization, bilateral symmetry, and are acoelomate, lacking any body cavity. S3. Aschelminthes are pseudocoelomates with a complete digestive system and organ-system level of organization. S4. All coelomates, such as Annelids and Molluscs, possess a body cavity lined by mesoderm and invariably exhibit metameric segmentation. S5. Notochord is a mesodermally derived, rod-like structure present in all Chordates throughout their embryonic development, and in some, persists throughout life.
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