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Question : How does exchange of gase take place in roots of plants ?

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Solution :Root cells take up OXYGEN from soil by the process of diffusion. Root hair remain in contact with `O_(2)`present in between the soil particles. `O_(2)` diffuses into the root hair and PASSES into other cells of root . Simulataneously, `CO_(2)` moves out into the soil . Older protionsof root do not have root hairIn suchareastiny openings called lenticelsare presentthrough which exchange takes place :
NOTE : In older stem ALSO lenticels are present for GASEOUSEXCHANGE whilein youngherbaceous stems, stomata are present for this purpose.


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