How do most insects respire?
✓ Correct answer: d) By tracheal system
ExplanationInsects primarily breathe through the tracheal system, a highly specialized network of tubes that deliver oxygen directly to their tissues and remove carbon dioxide.The tracheal system consists of tubes (tracheae) that branch out from the insect’s spiracles (small openings on the body surface) to deliver oxygen directly to the cells.Air enters through the spiracles and travels through the tracheae, which are connected to smaller branches called tracheoles that penetrate the tissues of the insect.This allows for efficient gas exchange at the cellular level. air sac dorsal tracheal trunk Thoracic spiracles First abdominal spiracle Spiracular branch Ventral branch Ventral tracheal truck Eight abdominal spiracle Visceral branch 425
Practice more Science PYQs
Attempt a free 10-question quiz or browse the full Science & Technology previous-year-question bank with instant answers and explanations.
🔬 Science PYQs →