Q.40 The Sea anemones and corals belongs to the phylum :
- Platyhelminthes
- Coelenterata
- Porifera
- Echinodermata
Sea anemones and corals belong to the phylum Coelenterata.
This multiple-choice question tests basic invertebrate zoology knowledge, common in exams like GATE Life Sciences.
Option Analysis
Platyhelminthes: Flatworms with bilateral symmetry, acoelomate bodies, and no cnidocytes; examples include planaria and tapeworms. They lack the polyp or medusa forms seen in sea anemones.
Coelenterata (now Cnidaria): Radial symmetry, diploblastic, with cnidocytes for stinging; includes polyps like sea anemones (Actiniaria) and corals (Scleractinia) in class Anthozoa.
Porifera: Sponges with cellular organization, no true tissues, and choanocytes for filter-feeding; no tentacles or stinging cells.
Echinodermata: Deuterostomes with spiny skin, water vascular system, and pentaradial symmetry as adults; includes starfish and sea urchins, unrelated to cnidarians.
Sea anemones and corals phylum is a frequent query in molecular biology and zoology prep, especially for competitive exams. These marine invertebrates share key traits under Coelenterata (modern: Cnidaria), making it the correct answer over Platyhelminthes, Porifera, or Echinodermata.
Key Characteristics
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Cnidocytes and Nematocysts: Stinging cells for prey capture, absent in other options.
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Polyp Body Form: Solitary (anemones) or colonial (corals) polyps with gastrovascular cavity.
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Anthozoa Class: Subphylum Anthozoa includes Hexacorallia (stony corals, anemones) and Octocorallia (soft corals).
Why Not Other Phyla?
Phylum Key Features Why Incorrect for Sea Anemones/Corals Platyhelminthes Flat, acoelomate, hermaphroditic No stinging cells; free-living or parasitic. Porifera Porous, filter-feeders, asymmetrical No tissues or tentacles. Echinodermata Spiny skin, tube feet Adult pentaradial symmetry. Coelenterata Radial, diploblastic, cnidocytes Matches polyp structure perfectly. Exam Relevance
In Indian curricula (CBSE, GATE), Coelenterata covers these due to historical taxonomy; modern texts use Cnidaria but retain the term for MCQs. Corals form reefs via calcium carbonate skeletons, vital for biodiversity.
This breakdown aids biology students in Jaipur or elsewhere mastering sea anemones and corals phylum for quizzes.
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