Lower Phyla Classification & Organization — NEET Biology
📚 Practice ConceptPorifera includes multicellular animals which exhibit cellular level of organisation and have characteristic flagellated choanocytes. The coelenterates have tentacles and bear cnidoblasts. They are mostly aquatic, sessile or free-floating. The ctenophores are marine animals with comb plates. The platyhelminthes have flat body and exhibit bilateral symmetry. The parasitic forms show distinct suckers and hooks. Aschelminthes are pseudocoelomates and include parasitic as well as non parasitic roundworms.
Which of the following statements about Phylum Porifera are NOT correct? S1: Sponges are typically sessile, predominantly marine organisms with a cellular level of organisation. S2: They exhibit either radial or bilateral symmetry depending on the species and are generally triploblastic. S3: Digestion in Porifera is exclusively extracellular, occurring within a central gastro-vascular cavity. S4: Choanocytes are unique flagellated cells that create water currents and aid in food gathering. S5: Their body support system consists of a notochord during embryonic development and a vertebral column in adults.
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