| Front | An insect lives in air. Describe how the insect is able to obtain oxygen and limit water loss. ( 6 marks) |
|---|---|
| Back | 1 Air enters through (open) spiracles; 2 Through tracheae; 3 Diffusion gradient in trachea 4 Tracheae associated with all cells/closely associated with cells; 5 Oxygen diffuses into cells; 6 Ventilation replacing air in tracheae; 7 Body covered with (waterproof) waxy layer/cuticle; 8 Spiracles are able to close; |
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