Question

Match the following columns and select the correct option.
$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ \left(a\right)& 6-15\text{pairs of gill slits}& \left(i\right)& \text{Trygon}\\ \left(b\right)& \text{Heterocercal}& \left(ii\right)& \text{Cyclostomes}\\ & \text{caudal fin}& & \\ \left(c\right)& \text{Air bladder}& \left(iii\right)& \text{Chondrichthyes}\\ \left(d\right)& \text{Poison sting}& \left(iv\right)& \text{Osteichthyes}\end{array}$

• 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)

Answer 1

The correct option is C (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

(a) Cyclostomes are living jawless vertebrates. They have an
elongated body with 6-15 pairs of gill slits for respiration.

(b) Chondrichthyes includes cartilaginous fishes.
They have a heterocercal caudal fin (caudal fin composed of two asymmetrical lobes).

(c) Osteichthyes includes bony fishes in which an air bladder is present which regulates buoyancy.

(d) Trygon (stingray) belongs to Chondrichthyes. This fish has poison sting.