3. Sclerenchyma provides mechanical strength to the plants. It is thin-walled and parenchymatous. 16. Draw a well labelled diagram of xylem. Remember to label "perforations" for those circular stuff on the xylem (or you can draw them just as horizontal lines with a gap in the middle. These are called medullary bundles. 15. Vascular bundles of innermost and middle rings are medullary bundles. Interfascicular cambium also soon becomes active and cuts internally the row of cells which becomes thick-walled and lignified and are known as conjunctive tissue. Award 1 for each structure clearly drawn and correctly labelled. Two medullary bundles are present in pith. 14. The meristematic tissue, instead of cutting separate vascular tissues, cuts individual vascular bundles. Monocot roots, interestingly, have their vascular bundles arranged in a ring. Name the types of nitrogenous bases present in the RNA. These are leaf trace bundles. Single-layered epidermis consists of small, radially elongated cells. Anamalous Dicotyledonous Stems. The types are: 1. (a) 1. asked Feb 6, 2018 in Class IX Science by navnit40 (-4,939 points) tissues. It is circular in outline and exhibits following tissues from outside with-in: 1. 18. Xylem consists of wide vessels present on the outer side representing the metaxylem and narrow vessels present towards inner side representing the protoxylem. The adaxially placed palisade parenchyma is made up of elongated cells, which are arranged vertically and parallel to each other. The epidermis is replaced by a secondary protective tissue by increase in growth of the stem of the plant. 1 answer. 8. T.S. Primary xylem consists of protoxylem and metaxylem. Which organelle is known as “power house” of the cell? Bundle sheath is present in the form of a large patch on the outer side and a small strip on the inner side of vascular bundle. Vessels have perforated end walls with scalariform and regularly arranged holes ………..Angiosperms, (b) 1. Xylem fibres provide mechanical strength to the plant body. It is mainly concerned with the conduction of water and minerals. WRITE THE DIFFERENCE BETWEEN THEM? In the old stem endodermis is not clear. 536 D & E) and libiriform fibres (Fig. Many conjoint, collateral, open and endarch bundles are present in the pith. 1 - Root hair 2. 16. 6. Vascular bundles are present in three rings. epidermis, and it is conjoint, collateral, open and exarch. It is thin-walled and parenchymatous. 5. Chlorenchymatous cells are thin-walled, oval, full of chloroplasts and enclose many intercellular spaces. In the young stem are present many vascular bundles arranged in ring. Presence of vessels in the xylem……….. Angiosperms, 2. In old stems, however, it is not a conspicuous layer. Scattered vascular bundles…………………… Monocot. In the pericycle region, extrastelar cambium strips develop which produce secondary vascular bundles. 14. 8. The tissue associated with conduction of water, minerals and food materials in plants are called vascular tissue. In dicot stem intra fascicular cambium is present. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. It is “permanent increase in thickness due to the activity of vascular cambium and cork cambium in stelar and extrastelar regions”. Draw well labelled diagram. The cells are parenchymatous and extend from below the sclerenchyma up to the centre. Secondary cortex is either parenchymatous or chlorenchymatous. Vessels have perforated end walls with scalariform and regularly arranged holes ……….Angiosperms. Phellogen is a couple of layers thick. 12. Secondary vascular bundles and conjunctive tissues are present without any sharp limits. A) Instead of simple pit pore, it should be bordered pit. 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. 13. It possesses chloroplasts and carries out photosynthesis, is made up of parenchyma. 20. Xylem is a complex tissue. 17. 16. In old stems is present the periderm which consists of cork, cork-cambium and secondary cortex. The well labelled diagrams of these tissues are as follows: Question 52. Due to these changes the primary phloem becomes crushed and present next to pericycle. Cambium or meristematic tissue cuts many secondary vascular bundles only towards inner side. 15. It is two to three cells thick, sclerenchymatous and present just below the epidermis. 10. Collenchyma is several cells deep below the four protruded corners while only a few layers deep at the other places just beneath the epidermis. As a conducting strand, xylem forms a continuous channel through the roots, stem, leaves and other aerial parts. Due to the irregular activity of the cambium at certain places, the secondary phloem is formed towards inner side instead of secondary xylem. It has two types of cells – the palisade parenchyma and the spongy parenchyma. Ridges in young stem, vascular bundles which are barrel-shaped and contain starch draw a well labelled diagram of xylem region extrastelar. And companion cells and phloem outside the primary state which are barrel-shaped and contain starch.! Cells contain intercellular spaces many, tubular, thick-walled cells fibres or wood fibres mainly... Primary phloem, cambium, secondary phloem is present near the pith facing its protoxylem the! The following tissues from outside with-in: 1 so the xylem is present inner pericycle... This website includes study notes, research papers, essays, articles and vital... Called cork cambium is one-to few cells deep and its cells contain intercellular spaces are.... 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