What is the function of cnidoblasts in cnidarians?
Cnidoblasts (stinging cells) in cnidarians are used for defense and capturing prey by injecting toxins.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
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Stinging organelles in cnidarians are called
Stinging organelles unique to Cnidaria called nematocysts or cnidocysts housed within specialized epidermal cells termed cnidocytes derived from interstitial stem cells concentrated densest on tentacles oral disc. Each nematocyst consists of capsule containing coiled hollow harpoon thread bathed in toxin triggered to evert explosively penetrating prey. Multiple types penetrant glutinant adhesion volvent entangling. Formation involves Golgi synthesis. Distinguishing synapomorphy of phylum Cnidaria giving group name absent in Porifera and Ctenophora which possess adhesive colloblasts not stingin
Ref: NCERT Class 11 Biology, Chapter 4: Cnidaria nematocysts cnidocytes; Campbell Biology Chapter 33
Cnidarians are best described as
Sponge aquiferous system illustrates increasing complexity and filtration efficiency from simplest asconoid with thin wall single central spongocoel entirely lined by choanocytes to syconoid where wall folded into radial canals increasing choanocyte surface to most derived leuconoid where choanocytes restricted to numerous small spherical chambers interconnected by network of incurrent canals bringing water from ostia and excurrent canals draining to osculum through thick mesohyl. Leuconoid maximizes choanocyte surface to volume ratio enables larger body size generates powerful unidirectional
Ref: NCERT Class 11 Biology, Chapter 4: Cnidaria diploblastic radial symmetry; Campbell Chapter 33
