Question

Match List I with List II

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

Hint:

Propagative = Multiplies (Leafhoppers); Non-propagative = Just circulates (Whiteflies); Non-persistent = Stylet tip (Aphids).

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Virus transmission modes are closely linked to the taxonomy of the insect vectors.
Different groups of insects have specialized mouthpart structures and gut physiologies that favor specific types of virus relationships.
Detailed Explanation:
1. Non-persistent (A): Viruses are carried on the stylet tips and lost after one or two probes.
Aphids are the most common vectors for thousands of non-persistent viruses. (A-II)
2. Semi-persistent (B): Viruses are retained in the foregut for hours or days but do not circulate in the hemolymph.
While many insects can do this, Thrips transmit several viruses (like TSV) in this or related manners. (B-I)
3. Non-propagative (C): The virus circulates through the insect's body but does not multiply inside the vector.
Many Begomoviruses (like Tomato Leaf Curl) are transmitted by Whiteflies in this circulative, non-propagative manner. (C-IV)
4. Propagative (D): The virus circulates and multiplies inside the insect tissues.
Leafhoppers and Planthoppers are the classic examples of vectors for propagative viruses (like Rice Stunt or Rice Grassy Stunt). (D-III)

Step 2: Final Answer:
The matching results in (A)-(II), (B)-(I), (C)-(IV), (D)-(III).