Which of the following organisms belongs to Coelenterata (Cnidaria) ?

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Which of the following organisms belongs to Coelenterata (Cnidaria) ?

Planaria and liverfluke
Sea urchin and sea cucumber
Hydra and sea anemone
Euplectella and sycon
This question was previously asked in
UPSC CAPF – 2019
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The correct answer is C, Hydra and sea anemone.
Hydra and sea anemones are classic examples of organisms belonging to the phylum Coelenterata, also known as Cnidaria. This phylum includes organisms like jellyfish, corals, hydroids, and sea anemones, characterized by features like radial symmetry, a gastrovascular cavity, and specialized stinging cells called nematocysts.
Option A includes Planaria and liverfluke, which belong to the phylum Platyhelminthes (flatworms). Option B includes sea urchin and sea cucumber, which belong to the phylum Echinodermata. Option D includes Euplectella and sycon, which belong to the phylum Porifera (sponges).

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