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Question

Which of the following is a respiratory structure for insects? 


  1. Gills

  2. Skin

  3. Lungs

  4. Trachea


Solution

The correct option is D

Trachea


Insects and some other invertebrates exchange oxygen and carbon dioxide between their tissues and the air by a system of air-filled tubes called tracheae. Tracheae open to the outside through small holes called spiracles. In the grasshopper, the first and third segments of the thorax have a spiracle on each side. Another 8 pairs of spiracles are arranged in a line on either side of the abdomen.

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