what is the functcin of phleem
Answers
Answer:
Phloem is the vascular tissue in charge of transport and distribution of the organic nutrients. The phloem is also a pathway to signaling molecules and has a structural function in the plant body.
Answer:
Hi ,
1 Through the system of translocation, the phloem moves photo-assimilates, mainly in the form of sucrose sugars and proteins, from the leaves where they are produced by photosynthesis to the rest of the plant.
2 The sugars are moved from the source, usually the leaves, to the phloem through active transport. The next step, translocation of the photo assimilates, is explained by the pressure flow hypothesis.
3 When there is a high concentration of organic substance (in this case sugar) within the cells, an osmotic gradient is created. Water is drawn passively from the adjacent xylem over the gradient to create a sugar solution and a high turgor pressure within the phloem. The high turgor pressure causes the water and sugars to move through the tubes of the phloem, in to the ‘sink tissues’ (e.g. the roots, growing tips of stems and leaves, flowers and fruits).
4 When the sink receives the sugar solution, the sugars are used for growth and other processes. As the concentration of sugars reduces in the solution, the amount of water influx from the xylem also drops; this results in low pressure in the phloem at the sink. Where there are areas of high and low pressure, the photo-assimilates and water are consistently moved around the plant in both directions.
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