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Characteristics of Platyhelminthes, Ctenophora, and Porifera
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Select the correct statements: (A) Platyhelminthes are triploblastic pseudocoelomate and bilaterally symmetrical organisms. (B) Ctenophores reproduce only sexually and fertilization is external. (C) In tapeworm, fertilization is internal but sexes are not separate. (D) Ctenophores are exclusively marine, diploblastic and bioluminescent organisms. (E) In sponges, fertilization is external and development is direct. Choose the correct answer from the options given below:A (A), (C) and (D) onlyB (B), (C) and (D) onlyC (A) and (E) onlyD (B) and (D) onlyCtenophores reproduce only sexually with external fertilization (B is correct); tapeworms (hermaphroditic, sexes not separate) show internal fertilization (C is correct); ctenophores are exclusively marine, diploblastic, and bioluminescent (D is correct). Platyhelminthes are actually acoelomate (not pseudocoelomate; A is incorrect). In sponges, fertilization is internal (not external) and development is indirect, via a larval stage (not direct; E is incorrect). So B, C, D only.