Movement of phloem sap from a source to a sink Depends ultimately on the activity of proton pumps.
High turgor pressure propels "bulk flow" of phloem sap from source to sink, where sugars are quickly extracted from the phloem.
- When sugar is eliminated, the s rises, which forces the water to leave the phloem and return to the xylem, lowering the p.
- Translocation is the transport of organic compounds from their source, where they are created, to their sink, where they are needed.
- The leaf is the location where food is synthesized, while the section that consumes or stores the food is referred to as the sink.
- In contrast to the xylem, which only transports water upward, the phloem is engaged in transporting the sap both downward and upward from the sugar sources (plant structures such as leaves) to the sugar sinks.
- The phloem sap flows via these holes, known as sieve tube plates, which are part of the sieve tube elements that make up phloem.
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