The carbonic acid exchange theory is a mechanism that explains the absorption and transport of mineral salts in plants. This theory is based on the formation and dissociation of carbonic acid (H2CO3) in the presence of carbon dioxide (CO2) and water (H2O).
In this process, carbon dioxide is taken up by the plant through the stomata on the leaves and is converted into carbonic acid in the presence of water. This carbonic acid then dissociates into bicarbonate ions (HCO3-) and hydrogen ions (H+). The bicarbonate ions are then transported into the root cells through an exchange with other ions such as nitrate or chloride.
Once inside the root cells, the bicarbonate ions are converted back into carbonic acid, releasing carbon dioxide and water. The carbon dioxide can then be used by the plant for photosynthesis, while the mineral salts such as nitrates and chlorides are absorbed and transported throughout the plant for various metabolic processes.
Overall, the carbonic acid exchange theory explains how plants are able to efficiently absorb and transport mineral salts through the conversion and exchange of carbonic acid and other ions. This process ensures that plants have an adequate supply of essential nutrients for their growth and development.
Describe carbonic acid exchange theory of absorption and transport of mineral salts
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