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Which of the following options correctly matches a genus with its two characters and its phylum?
1. Obelia (i) Alternation of polyp and medusa Cnidaria
(ii) Comb plates help in locomotion
2. Nereis (i) Metameric segmentation Annelida
(ii) Jointed legs
3. Sepia (i) Gills have respiratory and excretory functions Arthropoda
(ii) File-like radula for rasping
4. Ascidia (i) Ventral heart Chordata
(ii) Notochord in larval tail

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answer is D.

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Detailed Solution

Sepia belongs to Mollusca.

Jointed legs are absent in Nereis.

Obelia lacks comb plates. Comb plates are a characteristic of ctenophores.

Ascidia has notochord in tail and ventral heart - Urochordata.

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