Discussion
Read the following statements :
A : Spiracles and stomata are pores through which insects and leaves exchange gases respectively.
B : Spiracles in an insect are more in number as compared to stomata in a leaf.
C : Both stomata and spiracles are present on the lower surface of leaves and insect's body respectively.
Choose the correct option.
Answer: D
Only A is true.
Insects exchange gases through spiracles, small openings on the body leading into tracheae, and leaves exchange gases through stomata. So A is correct.
B is false: a leaf has a very large number of stomata, thousands in every square centimetre, while an insect has at most about ten pairs of spiracles. C is false: spiracles lie along the sides of the insect's thorax and abdomen, not on a 'lower surface', even though stomata are mostly on the lower surface of a leaf. So every option including B or C is wrong.
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