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[5] (b) Account for the following : (i) Wilted lettuce leaves become crisp /firm when placed in cold water for a while. Draw a well labelled diagram of xylem. They intrude into the secondary xylem, and so the xylem cylinder appears ridged and furrowed. 18. Each cortical bundle faces its pointed xylem end towards outer side, i.e. Cork cambium is one-to few cells deep and consists of barrel-shaped, thin-walled cells. (c) 1. T.S. Ten vascular bundles are arranged in two rows of five each. Vascular bundles are conjoint, collateral, open and endarch. A cambial strip is present in between secondary xylem and secondary phloem. 5:42 3.5k + 3.0k + 3.0k + Draw a labelled diagram of alimentary canal of a cockroach. 9. In dicot stem intra fascicular cambium is present. Cambium produces the conjunctive tissue. Multicellular epidermal hair arise from some cells. 5. Xylem fibres provide mechanical strength to the plant body. 6. (a) 1. Describe the structure and function of different types of epithelial tissues. 11. A large number of stomata occur on the upper surface of leaves of aquatic plants. 14. The figure he drew is shown here. 536 D & E) and libiriform fibres (Fig. Phelloderm, phellem and phelloderm are collectively called as periderm. 5. done clear. i. Vascular bundles are conjoint, collateral, open and endarch………………. 21. They help in conduction when present in the secondary xylem. Intruded furrows (four) of secondary phloem are arranged in the form of a cross. As the stem continues to increase in girth due to the activity of vascular cambium the outer cortical and epidermal layers  get broken and need to be replaced to provide new protective cell layers. Well-developed ground tissue……………………. Normal Monocot Stems 2. Xylem and phloem constitute the vascular bundle. (i) Consists of vessels (protoxylem and metaxylem), tracheids and xylem parenchyma. 7. Draw a well labelled diagram of phloem. The well labelled diagrams of these tissues are as follows: Question 52. Xylem 4. Xylem is a complex tissue. 2. 165) with ridges and furrows, and reveals the following tissues from outside with-in: 1. Secondary vascular bundles and conjunctive tissues are present without any sharp limits. Secondary phloem ring is present inner to pericycle and consists of sieve tubes, companion cells and phloem parenchyma with no phloem fibre. 16. Parenchyma is present below the sclerenchyma or collenchyma in the ridges and directly below the epidermis in the grooves. For phloem label the "sieve plates" as those circular plates and label "companion cells" with the nuclei inside of them. Draw well labelled diagram. Primary xylem consists of protoxylem and metaxylem. A) Instead of simple pit pore, it should be bordered pit. Draw a well labelled diagram of xylem. Vascular bundles are of different size. 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T.S. A thick cuticle covers the outer wall of the cells of epidermis. 3. Draw a well labelled diagram of parenchyma and collenchyma. 19. The protoxylem is endarch and present near the pith. 1 answer. 3.5k SHARES (a) Name an organism that is made up two components which live together in symbiotic association. Since monocot leaves have parallel veins, a number of vascular bundles can be seen in a row in the section. 14. Welcome to BiologyDiscussion! 15. asked Feb 6, 2018 in Class IX Science by navnit40 ( … (a) 1. The outer cell differentiate into cork or phellem while inner cells differentiate into secondary cortex or phelloderm. Vascular bundles of innermost and middle rings are medullary bundles. 3. Scattered vascular bundles…………………… Monocot. 9. Which row of the table below shows substances transported through the phloem and xylem, and the direction of transport correctly? Name the different components of xylem and draw a living component ? 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. Well-differentiated cortex and well-developed pith. Stem, 4. It is circular in outline and reveals the following tissues from outside with-in: 1. The region extends upto the vascular tissues. Vascular bundles are conjoint, collateral and endarch. Due to the intrusion of the phloem at four places, secondary xylem is ridged and furrowed at four places. Outline and exhibits following tissues from outside with-in: 1 ( iv ) inner protoxylem and. Wood parenchyma and collenchyma just near the pith facing its protoxylem towards the exterior, meta-xylem towards the centre of... Your PDF File Share Your PPT File side differentiate into cork or phellem while inner cells differentiate into cork phellem... 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Are filled with chloroplasts and carries out photosynthesis, is made up of parenchyma, and so the.. Give reasons for ( a ) Name an organism that is made up of cellulose or,...

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