When spiracles are closed, the oxygen concentration in insect tracheae falls because oxygen is consumed in respiration and diffuses to tissues, while no new oxygen can enter the body.
When spiracles are closed, the oxygen concentration in insect tracheae falls because oxygen is consumed in respiration and diffuses to tissues, while no new oxygen can enter the body.
| Front | Explain what causes the oxygen concentration in the tracheae to fall when the spiracles are closed. ( 2 marks) |
|---|---|
| Back | (oxygen is used in) respiration; therefore diffuses (from tracheae) to tissues; oxygen unable to enter organism; |
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