BS Zoology Semester Exam MCQs

The hindgut helps conserve water and regulate salts. This is important for insects living in dry environments.

Air sacs are enlarged parts of the tracheal system. They can improve ventilation, reduce body weight, and support high oxygen demand during flight.

Insect salivary glands release secretions into the mouth region. Saliva can moisten food, contain enzymes, or support special functions in certain species.

At the neuromuscular junction, motor neurons communicate with muscle fibers. This allows nervous control of walking, flying, feeding, and other movements.

Malpighian tubules collect nitrogenous wastes from hemolymph and empty them into the gut. They also help maintain water and ion balance.

Insects have an open circulatory system. Hemolymph leaves vessels and flows through body spaces, transporting nutrients, wastes, and hormones but usually not most oxygen.

The insect nervous system includes a brain and a ventral nerve cord with ganglia. It controls sensory processing, movement, feeding, and reproductive behaviors.

At the neuromuscular junction, motor neurons communicate with muscle fibers. This allows nervous control of walking, flying, feeding, and other movements.

Malpighian tubules collect nitrogenous wastes from hemolymph and empty them into the gut. They also help maintain water and ion balance.

Insects have an open circulatory system. Hemolymph leaves vessels and flows through body spaces, transporting nutrients, wastes, and hormones but usually not most oxygen.

The insect nervous system includes a brain and a ventral nerve cord with ganglia. It controls sensory processing, movement, feeding, and reproductive behaviors.

At the neuromuscular junction, motor neurons communicate with muscle fibers. This allows nervous control of walking, flying, feeding, and other movements.