Correct option is D
Explanation -
Statement 1: Insect wings are extensions of cuticle and not true appendages.
True
Insect wings are not modified limbs; they are outgrowths of the exoskeleton (cuticle). They lack musculature inside and are not true appendages like legs or antennae.
Statement 2: In beetles, the hind wings function in flight.
True
In beetles (Coleoptera), the forewings (elytra) are hardened and used for protection, while the hind wings are membranous and used for flight.
Statement 3: Males of many cricket species have forewings modified to bear sound-producing structures.
True
Male crickets use forewings (tegmina) to produce sound (stridulation), which is important in mating calls.
Statement 4: Flies have a structure called frenulum, which joins the forewing to the hind wing.
NOT True — This is the correct answer.
The frenulum is found in moths (Lepidoptera), not flies (Diptera). In flies, the hindwings are reduced to halteres, which help in balance during flight, and there is no frenulum.
Correct answer is option d - Flies have a structure called frenulum, which joins the forewing to the hind wing.
