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Transportation in plant |
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Answer» Plants lack a regular circulatory system like animals have we all know that plants prepare their food from CO2 and water in their leave. The other materials present in Plant body like nitrogen, phosphorus and minerals are taken directly from the soil. The conduction of some materials to short distances occurs through diffusion while for longer distances a need of proper transportation system arises. Therefore, two pathways have developed in plants independently which comprise of. (1) Xylem tissues. (2) phloem tissues Both xylem and phloem carry substance from one part of the plant body to another. Xylem transports water and minerals obtained from the soil. Phloem transports products of photosynthesis from leaves to other parts of the plant . Plants have specialized vascular tissues for transportation of substances. There are two types of vascular tissues in plants, viz. xylem and phloem.Xylem: Xylem is responsible for transportation of water and minerals. It is composed of trachieds, xylem vessels, xylem parenchyma and xylem fibre. Trachieds and xylem vessels are the conducting elements. The xylem makes a continuous tube in plants which runs from roots to stem and right up to the veins of leaves.Phloem: Phloem is responsible for transportation of food. Phloem is composed of sieve tubes, companion cells, phloem parenchyma and bast fibres. Sieve tubes are the conducting elements in phloem. |
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