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Unformatted text preview: diffuses into the photosynthetic cells and the spaces around them. This loss of water from the xylem at the far end allows water to flow up the xylem tubes, creating continuous water movement. In the phloem cells, fluids move in a somewhat similar fashion. In many cases, there is a flow of carbohydrate from the source of production to a depository known as the sink. For example, sucrose is produced in a photosynthesizing leaf and is transported into phloem tubes. It exits the phloem far away in the root. This is the source-sink phenomenon. A constant flow of water is established in the phloem because water follows the carbohydrates by osmosis....
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This note was uploaded on 11/11/2011 for the course BIO 101 taught by Professor Pesthy during the Fall '07 term at Texas State.
- Fall '07