NEET Biology Chapter 11

Transport in Plants

Have You ever wondered how water reaches the top tall trees, or for that matters how and why substances move from one cell to the other. Whether all substances move in a similar way, in the same direction and whether metabolic energy is required for moving substances. Plants need to move molecules over very long distances, much more than animals do, they also do not have a circulatory system in place. Water taken up by the roots has to reach all the parts of the plant, up to the very tip of the growing stem. The photosynthesis or food synthesis by the leaves have also to be moved to all parts including the root tips embedded deep inside the soil. Movement across short distances, say within the cell, across the membranes and from cell to cell within the tissue has also to take place. To understand some of the transport processes that take place in plants, one would have to recollect one's basic knowledge about the structure of the cell and the anatomy of the plant body. We also need to revisit our understanding of diffusion besides gaining some knowledge about chemical potential and ions

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