All MCQs

Insect genitalia are often species-specific. Entomologists use their structure to distinguish closely related species, especially when external body features look similar.

The epidermis lies beneath the cuticle and secretes cuticular materials. During molting, it produces enzymes and new layers that allow the old exoskeleton to be replaced.

Filiform antennae are slender and thread-like, with segments of similar width. They are common in many insects and support general sensory detection.

Many butterflies have siphoning mouthparts. The proboscis uncoils to take nectar from flowers and coils again when not in use.

Compound eyes are made of many units called ommatidia. They provide a wide field of view and are useful for detecting movement, especially during flight or predator avoidance.

Sclerotization strengthens the cuticle after ecdysis by cross-linking cuticular proteins. It gives insects firm body plates and protective hard parts.

Plumose antennae have many hair-like branches, increasing surface area. This is useful for detecting faint chemical signals, such as sex pheromones in some insects.

Houseflies use sponging mouthparts to take liquid or liquefied food. The labella help spread and absorb food from surfaces.

Ocelli are simple light-sensitive organs. They generally help insects detect light intensity and maintain orientation rather than forming detailed images.

Sclerotization strengthens the cuticle after ecdysis by cross-linking cuticular proteins. It gives insects firm body plates and protective hard parts.

Plumose antennae have many hair-like branches, increasing surface area. This is useful for detecting faint chemical signals, such as sex pheromones in some insects.

Houseflies use sponging mouthparts to take liquid or liquefied food. The labella help spread and absorb food from surfaces.