Answer:
Plants take in oxygen and give out carbon dioxide. In the cells, oxygen is used to breakdown glucose into carbon dioxide and water as in other organisms. In plants each part can independently take in oxygen from the air and give out carbon dioxide. 
Leaves of the plants have tiny pores called stomata for exchange of oxygen and carbon dioxide. Like all other living cells of plants, the root cells also need oxygen to generate energy. Roots take up air from the air spaces present between the soil particles. The stems of some plants have tiny pores called lenticels which help in exchange of gases.
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