NEET 2020 · BiologyFish classesPrevious Year Question
Match the following columns and select the correct option. Column-I (a) 6-15 pairs of gill slits (b) Heterocercal caudal fin (c) Air bladder (d) Poison sting Column-II (i) Trygon (ii) Cyclostomes (iii) Chondrichthyes (iv) Osteichthyes Choose the correct option from those given below.
Answer: (C) a-ii, b-iii, c-iv, d-i. Cyclostomes have an elongated body bearing 6-15 pairs of gill slits, so (a)-(ii).
- A.a-iv, b-ii, c-iii, d-i
- B.a-i, b-iv, c-iii, d-ii
- C.a-ii, b-iii, c-iv, d-i✓
- D.a-iii, b-iv, c-i, d-ii
Correct Answer
(C) a-ii, b-iii, c-iv, d-i
Solution & Explanation
Cyclostomes have an elongated body bearing 6-15 pairs of gill slits, so (a)-(ii). The unequal-lobed heterocercal caudal fin is a feature of cartilaginous fishes (Chondrichthyes), so (b)-(iii). The air bladder that regulates buoyancy is present in bony fishes (Osteichthyes), so (c)-(iv). The poison sting is borne by Trygon (sting ray), so (d)-(i). Hence option C. NCERT Reference: Page 47, line 16
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