Answer :

A. Root: Exchange of gases between soil and roots takes place by the process of diffusion. Root hairs are the epidermal extensions of the roots which take up the air molecules present in soil, so oxygen diffuses into root hairs and then reaches all the cells of the plant. And carbon dioxide produced in the same manner through root hairs by the process of diffusion is moves out.

B. Stem: Stems of herbs have stomata through which by the process of diffusion oxygen is taken in to the cells of the plant and by the process of diffusion carbon dioxide is given out in the air. In case of hard and woody stems, they have lenticels to carry the process of respiration.


C. Leaves: Leaves also have stomata which are the small openings through which gases are exchanged by the process of diffusion.


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