Gaseous exchange primarily occurs through stomata, where carbon dioxide is taken in and oxygen is released during photosynthesis. However, exchange of gases can also occur across the surfaces of stems, roots, and leaves.
How does gaseous exchange occur in plants, and where does it predominantly take place?
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Gaseous exchange in plants primarily occurs through stomata, microscopic pores found on the surface of leaves, stems, and other plant organs. Stomata facilitate the uptake of carbon dioxide (CO2) essential for photosynthesis and the release of oxygen (O2) produced during this process. During the day, when photosynthesis is active, stomata open to allow CO2 entry. At the same time, O2 is released. However, stomata close at night to prevent excessive water loss. This exchange of gases takes place predominantly in the leaves, where a vast number of stomata are present, supporting the plant’s metabolic and growth processes.