How different parts of the flowering plants exchange gases with the atmosphere?
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The direction of exchange of gases between a plant and its surroundings depends upon the time of the day and the usage of the gases by the plant. Plants respire throughout the day, while photosynthesis takes place only in the presence of sunlight. In daytime, carbon dioxide produced in respiration by the plants is used by them in photosynthesis. So, carbon dioxide is not released into the environment.
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There are specialized organs or structures present on the surface of a plant to exchange gases. For example:
- On the surface of leaves, small mouth like openings is present called stomata. These openings exchange gases between plant and environment.
- On the surface of stem are small openings called lenticels which perform change of gases.
- Roots exchange gases through their thin walls of root hairs.
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