BS Zoology Semester Exam MCQs

The insect foregut receives food and may include structures such as crop and gizzard. It is lined with cuticle and helps store or mechanically process food.

Most insects use a tracheal system for gas exchange. Oxygen travels through spiracles and tracheae directly to tissues, reducing dependence on blood for oxygen transport.

The dorsal vessel functions as the insect heart and aorta. It moves hemolymph forward through the body cavity.

Hovering requires strong flight muscles and fine control of wing movement. Many flies and some bees can maintain position in air while feeding or surveying the environment.

The insect foregut receives food and may include structures such as crop and gizzard. It is lined with cuticle and helps store or mechanically process food.

Most insects use a tracheal system for gas exchange. Oxygen travels through spiracles and tracheae directly to tissues, reducing dependence on blood for oxygen transport.

The dorsal vessel functions as the insect heart and aorta. It moves hemolymph forward through the body cavity.

The insect neck contains cervical sclerites and membranes. This arrangement allows the head to move while still connecting it firmly to the thorax.

Raptorial forelegs are adapted for catching and holding prey. The praying mantis is a classic example of this predatory modification.

Direct flight muscles attach to wing bases and move wings directly. This mechanism occurs in some insect groups and allows controlled wing motion.

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 thorax is divided into prothorax, mesothorax, and metathorax. Each segment bears a pair of legs, while wings usually attach to the mesothorax and metathorax.