Plant structures and functions assigments
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The document discusses the internal structures and functions of plant stems. It observes under a magnifying glass that plant stems contain several thin, sticky tubes. It explains that these tubes allow materials like water and nutrients to be absorbed from the roots and transported throughout the plant, including to the leaves. Specifically, it describes the roles of xylem and phloem tissues in one-directional and bidirectional transport of water and sugars between different plant parts.
Plant structures and functions assigments
- 2. Plant Structures and Functions PARTS OF THE PLANT
- 3. Plant Structures and Functions I picked a garden plant. I placed the garden template in a plastic airless bag. After a week the satire and cut through the middle of its stem. I observe with the magnifying glass that it has several tubes. These tubes are very thin and sticky to each other. In the center there is a thicker tubite and it seems like an elongated hollow from the part of the root to the twigs of this little plant. Internal structures of the plant: I placed the garden template in a plastic airless bag
- 4. Explanation with my own words about internnal structure of the stem. Small tubes inside the stem The structure of these tubesallowsthe materialstobe absorbedandtravel from the root through the stem to the leaves. This trip in the xylema occurs in a single direction but in the phloem it is bidirectional.Bringingthe sugarstothe plantisnecessarysinceitfeedsonglucose.Inthistransport the plant needs water so that this journey of substances occurs inside the plant. The plant also through perspiration loses water. But water is also recycled by xylema. In the process of translocation, when the phloem is loaded with sucrose, water flows into the phloem through osmosis.Whenthe phloemisthe sugar sink,discharge occurs, whichmeansthat the sugar leaves, the water also flows out. I observe with the magnifying glass that it has several tubes. These tubes are very thin and sticky to each other. In the center there is a thicker tubite and it seems like an elongated hollow from the part of the root to the twigs of this little plant. TRASLOCATION I researched about the process of translocation in a plant. But I found it interesting to know that it is xylem, phloem in the plant since they are the tubes where the transport of material in the plant takes place. What is xylem? The xylem is a tube and transport system, that helps water and dissolved substances go to different plant parts. The dissolved substances are minerals from the soil and food previously stored in the stem and roots. The tubes are connected end to end. Xylem transport is said to be unidirectional, which means transport occurs in a single direction. If you cut the lower end of a plant stem and place it in a water-and-dye
- 5. solution for a few minutes or hours, the stem would absorb the solution and somehow retain the dye. If you examine the stem under a microscope, you would see that the dye is located in the xylem cells. Xylem cells are called vessel elements, tracheids and parenchymal cells. Every year, a tree gains new xylem because the old xylem dies. When you see the cut trunk of a tree, old xylem tubes appear like concentric rings. (http://sciencewithme.com/learn-about-transport-in-plants/) The phloem is another transport system in plants that carries food or sucrose, a type of sugar, from the leaves to other plant parts. Sucrose is actually an end-product of photosynthesis. Up to 30% of phloem sap is made up of sucrose. Phloem transport is bidirectional, which means that transport occurs in two directions. In flower-bearing plants or “angiosperms”, the special cells in phloem are called sieve-tube members. Phloem is always alive, which is why it does not form rings like those of xylem. Translocation is basically, phloem sap moves from a sugar source (leaves) to a sugar sink (like roots). The phloem loading and unloading process is called “translocation”. During translocation, when phloem is loaded with sucrose, water flows into phloem through osmosis. When the phloem sap reaches the sugar sink, unloading occurs, which means that as sugar goes out, water also flows out. Water is then recycled through xylem transport.