Natural Bast fibres are strong and cellulosic. The primary phloem is derived from the procambium of the apical meristem. 7. The phloem tissue consists of the following four elements (1) Sieve tubes (2) Companion cells (3) Phloem parenchyma and (4) Phloem sclerenchyma. Phloem:- Phloem is another type of complex tissue. Primary phloem shows an irregular arrangement of various types of cells. They are restricted to outer part. on Phloem and its Kinds ( Sieve elements , Companion cells , Phloem parenchyma , Phloem fibres ), Tissue system – epidermal tissue system and Functions, Vascular-tissue-system. Fibres and sclereids are two types of sclerenchyma cells that differ in shape. 3: Consists of mainly dead cells (only parenchyma is the living cells in the xylem). Xylem and phloem are the two types of vascular tissues that are present in plants. Phloem is made up of the following major components: Sieve element Companion cell Phloem parenchyma Phloem schlerenchyma In angiosperms, the sieve element is referred […] Composed of vessels, tracheids, parenchyma and fibres. The fibres of sclerenchyma associated with phloem are called phloem fibres or bast fibres. The xylem is dead whereas phloem is alive. The primary phloem elements that develop first from the procambium are smaller in size called the protophloem, whereas those develop later are larger in size called metaphloem. Sieve tubes: These are elongated cells with thin cellulose walls placed end to end which combinedly form a tube. 3. These are the strengthening and supporting cells. Like xylem, phloem (Nageli, 1858 term leptom for phloem by Haberlandt, 1914) is also a specialized complex tissue mainly responsible for the translocation of food materials. 10. Consists mainly of living cells (only fibres are the dead cells in the phloem). Function: It conducts the prepared food. The sieve tubes are long and narrow. The primary phloem is derived from the procambium of the apical meristem. They are not associated with companion cells. They store starch and fats. Answer : ... Q6 : Diagrammatically show the difference between the three types of muscle fibres. The phloem elements which are formed from the procambium of apical meristem are called primary phloem. Permanent tissue , simple tissue characteristics, Tissue system – Epidermal,Vascular and fundamental tissue system, Primary structure of monocotyledonous root – Maize root, Structure of dicotyledonous root – Bean root, Primary structure of dicotyledonous stem – Sunflower stem, Your email address will not be published. 8. It contains a lining layer of cytoplasm. Sclerenchyma Sclereids are cells which have a varying shape and are distributed in the cortex, pith, xylem, and phloem of the plants. 11. 6. Bast fibre (also called phloem fibre or skin fibre) is plant fibre collected from the phloem (the "inner bark", sometimes called "skin") or bast surrounding the stem of certain dicotyledonous plants.It supports the conductive cells of the phloem and provides strength to the stem. Phloem fibers, sieve tubes, sieve cells, phloem parenchyma, and companion cells: Location: At the center of the plant. 4: Conduct water and minerals. Phloem fibres are absent in the primary phloem of most of the angiosperms. Xylem Phloem. Moreover, xylem and phloem constitute vascular bundles when they are together. 1. It consists of four elements: companion cells, sieve tubes, bast fibres, phloem fibres, intermediary cells and the phloem parenchyma Key Differences between Simple Tissue and Complex Tissue. Q7 : Name the tissue responsible for movement in our body. Your email address will not be published. Sieve cells have sieve areas on their lateral walls only and are not arranged one above the other in linear rows. These are living cells. The sieve elements are wide, long and conspicuous. The upcoming discussion will update you about the differences between secondary phloem and primary phloem of plants. Xylem tissues include tracheids, vessels, fibres and parenchyma and serve in ascent of sap/water and minerals. They are composed of sieve cells and sieve-tube members. About Phloem. Phloem fibres are fewer. The phloem parenchyma is well evolved and abundant. Ø Both protophloem and metaphloem can conduct food materials. 2. Save my name, email, and website in this browser for the next time I comment. Ø Both components contain living and dead cells. Phloem parenchyma also contain resins and tannins in some plants. This is an important feature of sieve elements. Mostly in the bark. Surface Fibres . The xylem tissue in higher vascular plants transport water and dissolved minerals across the plant … Phloem is composed of four kinds of cells: sieve elements, companion cells,phloem parenchyma and phloem fibres. Sieve tubes are longer and narrower. 6. The protophloem is short lived. Sieve tubes are comparatively fewer. Phloem is made up of phloem fibres, phloem parenchyma, sieve cells and their accompanying companion cells. Given below are the important points which distinguish xylem with that of phloem: Xylem is the complex tissue of plants, responsible for transporting water and other soluble nutrients to the plants and the flow is unidirectional which is from root to the upper part of the plant, while on the other hand phloem is the another kind of the vascular, … It consists of four elements: companion cells, sieve tubes, bast fibres, phloem fibres, intermediary cells and the phloem parenchyma. Composed of sieve elements, companion cells, phloem parenchyma and phloem fibres. Companion cells are absent in pteridophytes and gymnosperms. Phloem transports food from leaves to various parts of the plant; Xylem: Xylem consists of tracheids, xylem fibres, vessels and xylem parenchyma. what is the difference between xylem and phloem. The so called pericyclic fibres are actually phloem fibres. Xylem vessels, fibre and tracheids. The companion cells are present only in angiosperms and absent in gymnosperms and pteridophytes. 2. In monocots, usually phloem parenchyma is absent. 1. The primary phloem (Figure 6) is composed of sieve elements and fibres. (iii) Phloem parenchyma (iv) Phloem fibres. The parenchyma cells associated with the phloem are called phloem parenchyma. The conduction of food material takes place through cytoplasmic strands. The engaging and detailed PowerPoint and accompanying resources have been designed to cover point 4.11 of the Pearson Edexcel A-level Biology A specification which states that students should be able to compare these tissues in terms of structure, position in … The basic components of phloem … The phloem fibres are usually found among the phloem parenchyma cells. Ø Both are complex tissues, composed of many types of cells. Composed of sieve elements, phloem parenchyma and fibres. This field is for validation purposes and should be left unchanged. Uploading you agree to our Privacy Policy, Terms of Use, and website in this browser for next! Which the food substances travel vascular cambium are called phloem parenchyma are slender, short cylindrical to with... Materials to various parts of the phloem parenchyma, phloem parenchyma are restricted to the sieve elements are the cells. Vascular tissues that are present in plants field is for validation purposes and should be unchanged. 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