As a conducting strand, xylem forms a continuous channel through the roots, stem, leaves and other aerial parts. The outer cells differentiate into cork or phellem while the inner cells differentiate into secondary cortex orphelloderm. Rest of the portion is filled with may large, thinwalled, parenchymatous cells which form ground tissue. In the mature stems showing secondary growth, cork cambium is present which cuts cork towards outer side and secondary cortex towards inner side. ... S can be xylem, Q can be blood and U can be parenchyma. Anamalous Dicotyledonous Stems. asked Feb 6, 2018 in Class IX Science by navnit40 ( â¦ Our mission is to provide an online platform to help students to share notes in Biology. ………. These cells are thickwalled and highly lignified and become dead on maturity. chlorenchyma and an innermost layer of endodermis. 1. T.S. There is a parenchymatous bundle sheath, which often contains chloroplasts and perform the function of photosynthesis. (c) 1.
(b) Give the function of each component. It originates near leaf primordia. (ii) Label the parts 1, 2, and 3 (iii) Which part of the heart is contracting in this phase ? Collenchyma is present just below the epidermis, in the form of six to ten or more layers in the ridges and only a few layers or none in the furrows. Share Your PDF File Log in, Concise Mathematics Class 10 ICSE Solutions 2018. The tissue between the upper and the lower epidermis is called the mesophyll. 5. A few multicellular hair are also arising from some cells. 11. These are much elongated fibres with tapering ends. (g) Xylem transports _____ and _____ from soil. Primary xylem is present near the pith. Cambium is single-layered, present in between xylem and phloem and remains bent towards inner side along the furrows of secondary phloem. (v) Protoxylem is surrounded by tracheids and xylem parenchyma. Draw a well labelled diagram of cardiac muscle found in the human body. Plants with a well-developed conductive system are thus called as âvascular plantsâ. It is rarely complete. Cambium is present in between secondary phloem and secondary xylem.
(b) Give the function of each component. Name the different components of xylem and draw a living component ? 21. This is clear how cork cambium forms tissues that form the cork. 17. DRAW THE LABELLED DIAGRAM OF PARENCHYMA, COLLENCHYMA AND SCLEVENCHYMA. Cross section of a tree trunk and stump: trunk: part of the tree, between the roots and the branches, consisting of wood on the interior and bark on the exterior.Stump: the remainder of the turnk including the roots after the tree is felled. Cortex ii. The continuity of the layer is broken by few stomata. 9. Thin-walled parenchymatous cells of ground tissue form the pith. 12. Explain its significance. 14. Mesophyll cells are isodiametric and are arranged compactly; they contain a number of chloroplasts. Nervous or the nerve tissue is the main tissue of our nervous system. Stem. 6. Stump: the remainder of the turnk including the roots after the tree is felled. It consists of thin-walled, rectangular cells arranged in radial rows. 14. 17. Vessels have perforated end walls with scalariform and regularly arranged holes ……….Angiosperms. 15. Central cavity of the cell is greatly reduced due to the formation of secondary thickening. 12. 14. Conjoint, collateral, open and endarch vascular bundles. 5. Ø Meta-xylem elements are circular in outline in the cross section. The zone is traversed by many secondary medullary rays. Phelloderm, phellem and phelloderm are collectively called as periderm. Vascular bundles are conjoint, collateral, open and endarch………………. A thick cuticle covers the outer wall of the cells of epidermis. 12. In old stems, however, it is not a conspicuous layer. Why is cambium considered to be a lateral meristem? Secondary xylem, which forms the major part of the section, consists of tracheids, vessels, fibres and prosenchyma. ………Dicot. Four longitudinal furrows of secondary phloem are present which are wedged in between the secondary xylem cylinder. It is well-differentiated and consists of few- layered collenchymatous hypodermis followed by chlorenchyma. 9. Nervous tissue consists of two cells: nerve cells or neurons and glial cells, which helps transmit nerve impulses and also provides nutrients to neurons. Chlorenchyma is present immediately below the cortex in the form of one or two layers. Draw a labelled diagram showing the tissues present in a dicotyledonous leaf. 536 D & E) and libiriform fibres (Fig. 1 - Root hair 2. Draw a well labelled diagram of this stage. Draw a well labelled diagram showing the tissue responsible for translocation of food from plants to other parts of plant body. 16. In the innermost ring are present two large bundles; in the middle ring the number ranges from 6 to 14 while the outermost ring consists of 15 to 20 vascular bundles. 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