NEET 2023 Phase 2 · BiologyCoelomPrevious Year Question
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:
Answer: (D) (B), (C) and (D) only. Platyhelminthes are acoelomate (not pseudocoelomate), so A is wrong.
- A.(A) and (E) only
- B.(B) and (D) only
- C.(A), (C) and (D) only
- D.(B), (C) and (D) only✓
Correct Answer
(D) (B), (C) and (D) only
Solution & Explanation
Platyhelminthes are acoelomate (not pseudocoelomate), so A is wrong. In sponges fertilisation is internal and development is indirect, so E is wrong. Ctenophores are exclusively marine, diploblastic, bioluminescent and reproduce only sexually with external fertilisation (B and D correct); flatworms like tapeworm have internal fertilisation and are not separate-sexed (C correct). Hence B, C and D are correct, matching option (d). NCERT Reference: Page 42, line 6
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