Question

Which of the following fits the classical definition of an entomopathogenic nematode?
(A) Oscheius
(B) Romanomermis
(C) Heterorhabditis
(D) Deladenus
Choose the correct answer from the options given below:

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

Hint:

EPNs carry symbiotic bacteria (Xenorhabdus/Photorhabdus) that kill insects within 48 hours.

Answer 1

The Correct Option is D

Step 1: A classical EPN needs obligate insect-killing plus a mutualistic bacterium.
Step 2: Heterorhabditis (C) fits, paired with Photorhabdus bacteria.
Step 3: Oscheius (A) also meets this profile in several species.
Step 4: Romanomermis (B) and Deladenus (D) fail the criteria, so the correct answer is (A) and (C) only.