Question

Pebrine is:

(A) Disease of silkworm
(B) Caused by protozoa
(C) Larva on death immediately emit foul smell
(D) Tiny black spots appear on larval integument

Choose the correct answer from the options given below:

• A. (A), (B) and (C) only.
• B. (A), (B) and (D) only.
• C. (A), (B), (C) and (D).
• D. (B), (C) and (D) only.

Hint:

Recall the defining symptom that gives pebrine its name.

Answer 1

The Correct Option is B

Step 1: Pebrine is a well known disease of silkworm, so (A) is correct.
Step 2: It is caused by Nosema bombycis, a microsporidian traditionally classed with protozoa, so (B) is correct.
Step 3: Infected larvae show tiny black or pepper like spots on the body wall, which is the origin of the name pebrine, so (D) is correct.
Step 4: Sudden foul smell on death of larva is a feature of a bacterial disease called flacherie, not pebrine, so (C) is incorrect. The answer is option 2.