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Assertion : Insects develop a complex sy...

Assertion : Insects develop a complex system of air tubes called trachea for respiratory purpose.
Reason : Exchange through body surface is not possible in insects.

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As the integument of insect is thick and impermeable ot minimize lose of body water , they can not carryout gas exchange though their body surface. To overcone this difficulty they have developed a complex system of air tubes called trachea to reach the air direclty near the tissue cells. Each trachea communicates with the exterior through openings in the body wall.
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ERRORLESS -BREATHING AND EXCHANGE OF GASES-Breathing And Exchange Of Gases
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