Which direction does xylem flow? Name 4 organic molecules and inorganic ions that the phloem can transport. The availability of water can change the bulk-flow of food in the phloem O B. However, the direction of movement is based on a single principle: the movement is from a source to a sink. The direction of sieve plates in the phloem sieve tube elements become opposite at different times O C. This is called translocation . The translocation of molecules in the phloem from the source goes in what direction. 1 decade ago. We take some of the sugars, put it into the phloem, then we make sure it transports through the phloem till here, and then we remove the sugar and put it into this cell. Phloem tissue is composed of the sieve elements, companion cells or albuminous cells, phloem parenchyma and phloem … Thus, the typical direction of transport is downward from the primary source (leaves) to the major sink (roots). One of the three general characteristics of all plants is that they are multicellular. prairiedog. up AND down. Phloem and xylem are closely associated and are usually found right next to one another. Rate of phloem transport Because of that, individual cells cannot acquire all the nutrients they need by themselves; they need the assistance of specialized tissues for the movement of materials within the plant. Phloem transports sucrose and amino acids up and down the plant. One xylem and one phloem are known as a ‘vascular bundle’ and most plants have multiple vascular bundles running the length of their leaves, stems, and roots. But a couple of questions could be how does the phloem know in which direction to transport this food? In xylem the direction of transport is from root to shoot, whereas in phloem it is from shoot to root and every living plant part. Mechanism of Phloem Transport: The mechanism of long-distance transport through the sieve tube is soundly based on the internal organization of sieve tubes, without which it remains speculative. Unlike xylem, phloem vessels contain cytoplasm, and this goes through holes from one cell to the next. 5 Answers. Answer. During the growth of a plant, its leaves act as the source of food as they carry out photosynthesis. Question 7 of 15 1.0 Points Why is the direction of phloem transport opposite in early spring and late fall? Whereas xylem cells conduct water and minerals only upwards from the roots, phloem cells transport their contents in various directions. W-X, Water, Xylem. The relay hypothesis does not conflict with Münch’s vision of phloem transport: the osmotically generated pressure flow is still the main mechanism of moving solutes between sites of active transport, but the speed and direction are additionally controlled near the relays (Thompson and Holbrook, 2003a). A. Transport in Phloem Tissue . Xylem tissue is used mostly for transporting water from roots to stems and leaves but also transports other dissolved compounds. The phloem conducts the food from the source to the sink (the part of the plant requiring or storing food). sucrose + amino acids, potassium and magnesium ions. Explain why xylem transport is unidirectional and phloem transport bi-directional. Relevance. What about phloem? Phloem, also called bast, tissues in plants that conduct foods made in the leaves to all other parts of the plant.Phloem is composed of various specialized cells called sieve tubes, companion cells, phloem fibres, and phloem parenchyma cells. Answer Save. Water enters the plant through the roots, so moves upward. That makes sense, right? Conclusions - phloem transports organic materials from sites of production (called a source) to a site of need (called a sink). Favorite Answer.

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