Insect tracheal system opens to the outside through

Spiral value

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Pecten

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Spiracle

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Taenidia

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Solution

The correct option is C Spiracle
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. Hence, Insect tracheal system opens to the outside through a spiracle.
So, the correct answer is 'spiracle'

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Similar questions

Respiration in insects is called direct because

(a) the cells exchange $O_{2} / C O_{2}$ directly with the air in the tubes

(b) the tissues exchange $O_{2} / C O_{2}$ directly with the air in the tubes

(d) tracheal tubes exchange $O_{2} / C O_{2}$ directly with the haemocoel which then exchange with tissues

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