Question

Match List-I with List-II.

\[ \begin{array}{|c|l|c|l|} \hline \textbf{List-I} & & \textbf{List-II} & \\ \hline A & \text{Palisade Worm} & I & \textit{Ostertagia ostertagi} \\ B & \text{Twisted Worm} & II & \textit{Syngamus trachea} \\ C & \text{Brown Stomach Worm} & III & \textit{Haemonchus contortus} \\ D & \text{Gape Worm} & IV & \textit{Strongylus equinus} \\ \hline \end{array} \] 
Choose the correct answer from the options given below:

• (A) - (IV), (B) - (III), (C) - (I), (D) - (II)
• (A) - (I), (B) - (IV), (C) - (III), (D) - (II)
• (A) - (III), (B) - (II), (C) - (IV), (D) - (I)
• (A) - (III), (B) - (IV), (C) - (I), (D) - (II)

Hint:

Common names often describe the disease clinical signs (e.g., *Syngamus trachea* causing "gapes" in birds) or morphological appearance (e.g., *Haemonchus contortus* as the "twisted/barber's pole worm").

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
This question requires matching the widely used common names of various veterinary nematodes with their correct scientific names.
Detailed Explanation:
Let us match the common names in List-I with the scientific names in List-II:
(A) Palisade worm: This is the common name given to the large strongyles of horses, primarily Strongylus equinus (and also S. vulgaris and S. edentatus), because of the thick, palisade-like walls of their buccal capsule.
Thus, (A) matches with (IV).
(B) Twisted worm: This refers to Haemonchus contortus, commonly known as the "twisted stomach worm" or "barber's pole worm" of ruminants.
The white ovaries winding around the red, blood-filled intestine of the female worm give it a distinctive twisted appearance.
Thus, (B) matches with (III).
(C) Brown stomach worm: This refers to Ostertagia ostertagi, which resides in the abomasum of cattle and is commonly called the medium or brown stomach worm.
Thus, (C) matches with (I).
(D) Gape worm: This refers to Syngamus trachea, a red nematode found in the trachea of poultry.
It causes the birds to open their mouths wide to gasp for air ("gapes").
Thus, (D) matches with (II).
Combining these matches, we get: (A) - (IV), (B) - (III), (C) - (I), (D) - (II).

Step 2: Final Answer:
The matched sequence corresponds to option (A).