Question

Given below are two statements:
Statement (I): Virus transmission by whitefly is persistent and circulative type.
Statement (II): Virus transmission by hoppers is circulative and usually propagative type.

• A. Both Statement (I) and Statement (II) are true.
• B. Both Statement (I) and Statement (II) are false.
• C. Statement (I) is true but Statement (II) is false.
• D. Statement (I) is false but Statement (II) is true.

Hint:

Whiteflies = circulative; Hoppers = usually circulative but not always propagative.

Answer 1

The Correct Option is C

Whiteflies transmit viruses like TYLCV in a persistent circulative manner.
Virus transmission by hoppers is generally circulative but not always propagative, hence Statement (II) is false here.

Answer 2

Transmission modes are generally classed as non-persistent, semi-persistent, or persistent, with persistent transmission further split into circulative and circulative-propagative types. Whitefly-borne viruses fit the persistent-circulative category exactly, so the first statement is accurate. Leafhopper- and planthopper-borne viruses, however, are not uniformly propagative - many are simply circulative without multiplying inside the vector, so describing hopper transmission as 'usually propagative' overstates the case, making the second statement inaccurate. Statement (I) is true but Statement (II) is false.