Phloem is a heterogeneous tissue composed of four different types of cells (sieve elements, companion cells. This transport process is called translocation. It consists of four types of cells, viz. Now, one theory is generally accepted as the correct explanation for translocation.

The pH at loading site is quite acidic compared with the phloem sap (5.5. to 6.0). Unlike the xylem, phloem conducts in both directions. Sieve Tube Function. Phloem Tissue. This theory called the pressure flow hypothesis is favoured by most plant physiologists and was …

Ø Usually, the phloem is situated external to xylem.. Ø In leaves, the phloem is located on the abaxial side (lower side).. Ø In some plants (members of Cucurbitaceae and Convolvulaceae), the phloem is present on both external and internal to xylem. Phloem (pronunciation: / ˈ f l oʊ. It is responsible for transporting food from the leaves to the other parts of the plant. Such a vascular bundle …
Xylem fibres are supportive in function. Phloem parenchyma cells and phloem fibres) that are similar in origin and major function but differ in structure. Phloem was introduced by Carl Nägeli in 1858 after the discovery of sieve elements. Choose from 500 different sets of Phloem flashcards on Quizlet.

The xylem and phloem are grown within the central section of a root called a ‘stele’. Phloem definition, the part of a vascular bundle consisting of sieve tubes, companion cells, parenchyma, and fibers and forming the food-conducting tissue of a plant. See more. (b) Phloem: Phloem transports organics food inside the body of the plant. Hypothesis of Phloem Translocation. Xylem and phloem give vascular plants their classification; they are the vascular tissues that transport substances throughout the plant. Phloem-It consists of four of elements: sieve tubes, companion cells, phloem fibres and the phloem parenchyma. ə m /) is the living tissue in vascular plants that transports the soluble organic compounds made during photosynthesis and known as photosynthates, in particular the sugar sucrose, to parts of the plant where needed.
Learn Phloem with free interactive flashcards. The xylem parenchyma is responsible for storing the prepared food and assists in the conduction of water. The main function of xylem is to transport water, and some soluble nutrients including minerals and inorganic ions, upwards from the roots to the rest of the plant. This transport process is called translocation. em (flō′ĕm′) n. The tissue of vascular plants that conducts food produced by photosynthesis to all parts of the plant and consists of sieve elements, fibers, and parenchyma. Phloem definition is - a complex tissue in the vascular system of higher plants that consists mainly of sieve tubes and elongated parenchyma cells usually with fibers and that functions in translocation and in support and storage. The end walls of these cells are called sieve plates. Function of Xylem.


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