Question

Plerostigmata is present on forewings of:
(A) Hymenoptera
(B) Psocoptera
(C) Megaloptera
(D) Mecoptera
Choose the correct answer from the options given below:

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

Hint:

The stigma helps prevent wing damage during flight by increasing rigidity at high angles of attack.

Answer 1

The Correct Option is A

Step 1: Pterostigma strengthens and stabilises the forewing tip in orders with strong, sustained flight.
Step 2: Psocoptera and Megaloptera do not show this structure, so eliminate any option containing (B) or (C).
Step 3: Hymenoptera and Mecoptera both possess a distinct pterostigma.
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