NEET 2016 Phase 2 · BiologyVertebrate gridPrevious Year Question
Choose the correct statement. (a) All mammals are viviparous (b) All cyclostomes do not possess jaws and paired fins (c) All reptiles have a three-chambered heart (d) All pisces have gills covered by an operculum
Answer: (B) All cyclostomes do not possess jaws and paired fins. Answer: All cyclostomes lack jaws and paired fins.
- A.All mammals are viviparous
- B.All cyclostomes do not possess jaws and paired fins✓
- C.All reptiles have a three-chambered heart
- D.All pisces have gills covered by an operculum
Correct Answer
(B) All cyclostomes do not possess jaws and paired fins
Solution & Explanation
Answer: All cyclostomes lack jaws and paired fins. Solution: Cyclostomes (Agnatha) have a jawless circular mouth and a body devoid of paired fins, so (b) is correct. (a) fails because egg-laying mammals exist; (c) fails because crocodiles have a four-chambered heart; (d) fails because only Osteichthyes have an operculum while Chondrichthyes do not. NCERT Reference: Page 47, lines 17-19 (Cyclostomes lack jaws, scales and paired fins)
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