Practice question
Question
Level of organization in Porifera is
Explanation
Porifera exhibits cellular grade organization lacking true embryonic tissues meaning cells not arranged into permanent germ layers with basal lamina, zonula adherens or coordinated epithelial function. Division of labour exists among pinacocytes covering, choanocytes feeding, amoebocytes transporting and sclerocytes secreting spicules, but each retains totipotency capable of transdifferentiation after dissociation and reaggregation. Neural or muscular syncytia absent, signalling via calcium waves and paracrine factors. Canal system transports water not blood, demonstrating cellular not tissue level despite multicellularity among metazoans. This concept holds high importance for NEET, CBSE board, CUET and competitive examinations focusing on comparative
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