| (i) It consists of a network of trachea, that open through 12 pairs of small holes called spiracles present on the lateral side of the body. |
| (ii) Thin branching tubes carry oxygen from the air to all the parts. |
| (iii) The opening of the spiracles is regulated by sphincters. |
| (iv) Exchange of gases take place at the tracheoles by diffusion. |
A) Only (i)
B) (i), (ii) and (iii)
C) (ii), (iii) and (iv)
D) All of the above
Correct Answer: C
Solution :
[c] In cokroach, respiratory system consists of a network of trachea, that open through 10 pairs of small holes called spiracles present on the lateral side of the body.
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