Number of spiracles present in cockroach is___________?
Correct answer: C. 20
- A. 15
- B. 10
- C. 20
- D. 30
Explanation
Cockroaches possess 10 pairs of spiracles, two pairs on the thorax and eight pairs on the abdomen. Therefore, the total number is 10 x 2 = 20 spiracles. Students may choose 10 by counting pairs rather than individual spiracles.
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About Human Respiratory System
The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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