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Cnidaria
1 / 20
Which one of the following has biradial symmetry?
Jellyfish such as Aurelia show biradial symmetry due to arrangement of tentacles and sense organs.
2 / 20
In coelenterates the characteristic larva is:
Planula larva is a free swimming ciliated larval stage that develops into a polyp.
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Which of these is not a coelenterate?
Silverfish is an arthropod insect. Jellyfish, sea anemone and Physalia belong to phylum Cnidaria.
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What is the characteristic feature of Coelenterata?
Gastrovascular cavity is the central digestive cavity with a single opening acting as mouth and anus.
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Scyphozoan medusae are commonly known as:
Class Scyphozoa contains true jellyfish where medusa stage dominates.
6 / 20
Generic name of sea fur is:
Pennatula (sea pen) is a colonial anthozoan.
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Gonads of Obelia occur:
Gonads are present in radial canals of the medusa stage.
8 / 20
Metagenesis occurs in:
Metagenesis is alternation of asexual polyp and sexual medusa stages. It occurs in Obelia.
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Tentaculocyst in jellyfish helps in:
Tentaculocysts or rhopalia contain sensory organs for balance, light detection and chemical sensing.
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Which one of these is a cnidarian?
Sea anemone belongs to class Anthozoa of phylum Cnidaria.
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Ephyra is the larva of:
Ephyra is the juvenile medusa stage formed during strobilation in Aurelia.
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Organ pipe coral is:
Tubipora musica forms red tubular skeleton resembling organ pipes.
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Portuguese man of war is:
Physalia is a colonial hydrozoan called Portuguese man-of-war showing polymorphism.
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Coelenterates are characterized by:
Presence of stinging cells (nematocysts) used for prey capture and defense. Other features: diploblastic body and radial symmetry.
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The generic name of common jellyfish is:
Aurelia aurita is the common moon jellyfish.
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The scientific name of red coral moonga is:
Corallium rubrum is precious red coral used in jewellery.
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Medusa the reproductive stage is found in:
In Obelia, medusa is the sexual stage producing gametes.
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Function of a dactylozooid in polymorphic colony is:
Dactylozooids are defensive zooids rich in nematocysts used for protection and prey capture.
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Coelenterates differ from other animals in having:
Cnidarians possess specialized stinging cells called nematocysts used for prey capture and defense. Key revision points: diploblastic body plan, radial symmetry, tissue level organization, gastrovascular cavity.
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Statocysts are found in:
Statocysts are equilibrium organs found in medusae such as Obelia medusa.
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