Gas Exchange in Plants: Stomata & Lenticels — NEET Biology
📚 Practice ConceptWell, the answer to this question is not quite so direct. Yes, plants require O2 for respiration to occur and they also give out CO2. Hence, plants have systems in place that ensure the availability of O2. Plants, unlike animals, have no specialised organs for gaseous exchange but they have stomata and lenticels for this purpose. There are several reasons why plants can get along without respiratory organs. First, each plant part takes care of its own gas-exchange needs. There is very little transport of gases from one plant part to another. Second, plants do not present great demands for gas exchange. Roots, stems and leaves respire at rates far lower than animals do. Only during photosynthesis are large volumes of gases exchanged and, each leaf is well adapted to take care of its own needs during these periods. When cells photosynthesise, availability of O2 is not a problem in these cells since O2 is released within the cell. Third, the
Which of the following statements correctly explain the adaptive features enabling plants to manage without specialized respiratory organs? S1. The metabolic demands for gas exchange in plants are considerably higher than in animals. S2. Gases are largely transported over long distances within the plant body to meet the needs of all cells. S3. Most living cells in a plant are located close to the surface, reducing diffusion distances for gases. S4. The loose packing of parenchyma cells creates an extensive internal network of air spaces for efficient gas diffusion. S5. During photosynthesis, the oxygen released internally within the cells adequately meets their respiratory needs.
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