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Lenticels are in the small area of a bark. These cells are loosely placed and therefore allow the gaseous exchange of respiratory gases between air and living cells of the woody stem. ... It is through stomata that oxygen from air diffuses into the stem and goes to all the cells of a stem for respiration.
Leaves possess stomata – tiny pores, for gaseous exchange. The oxygen consumed via stomata is used up by cells in the leaves to disintegrate glucose into water and carbon dioxide.
Root hairs are basically in contact with tge soil where there are some air spaces present the air of these spaces are diffused into tge root haur which reaches the cells. In plants respiration is carried out by the process of diffusion.
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