BS Zoology Semester Exam MCQs

Cerci are paired appendages at the end of the abdomen in some insects such as cockroaches. They often detect air movements or touch.

The insect cuticle includes an outer epicuticle and deeper procuticle regions such as exocuticle and endocuticle. This layered design provides protection, support, and resistance to water loss.

Because the exoskeleton cannot expand continuously, insects grow by molting. Ecdysis is the shedding stage in which the old cuticle is cast off.

Chewing mouthparts rely on strong mandibles. Grasshoppers and cockroaches use this type to cut, crush, and process solid food.

The insect head is a hardened capsule made of fused segments. It supports feeding structures and major sensory organs such as compound eyes and antennae.

The waxy epicuticle is important for terrestrial insects because it limits evaporation. This helps insects survive in dry habitats where water conservation is essential.

Insect antennae carry many sensory receptors. They help detect odor, touch, humidity, and other environmental cues, making them important for feeding, mating, and habitat selection.

Piercing-sucking mouthparts are adapted for feeding on plant sap or animal fluids. Needle-like stylets penetrate tissue while the insect draws liquid food.

Cephalization places sensory organs and mouthparts near the front of the body. This improves environmental detection and coordinated feeding behavior.

The waxy epicuticle is important for terrestrial insects because it limits evaporation. This helps insects survive in dry habitats where water conservation is essential.

Insect antennae carry many sensory receptors. They help detect odor, touch, humidity, and other environmental cues, making them important for feeding, mating, and habitat selection.

Piercing-sucking mouthparts are adapted for feeding on plant sap or animal fluids. Needle-like stylets penetrate tissue while the insect draws liquid food.