Question

In insects, oxygen is carried to different tissues by

• A. Diffusion through surface
• B. Tracheal tubes
• C. Respiratory pigment through blood
• D. Gills

Answer 1

The correct option is B Tracheal tubes

Insects have a system of tubes, called as tracheae, instead of lungs. These tracheae penetrate right through the insect's body. Air enters the tracheae by pores called as spiracles. These spiracles are found on each side of the insect's abdomen. The tracheae finally come to an end in the tissues which are respiring.

Therefore, the correct answer is option B.