They provide mechanical strength and rigidity to the plant. [NCERT Exemplar] Answer: Question 11. 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. 3. 9. Answer: (i) The cells are long and spindle-shaped. The xylem in the root systems are vital for gathering water from the ground and delivering it to all parts of the plant so that growth can be consistent and the leaves get nourishment as well. For phloem label the "sieve plates" as those circular plates and label "companion cells" with the nuclei inside of them. The outer wall of cells is covered by a thick cuticle. Stump: the remainder of the turnk including the roots after the tree is felled. Several minute openings or stomata are found on the epidermis of all the green aerial parts of plants, but are abundant on the lower surface on the leaves as they regulate the process of transpiration. Nervous or the nerve tissue is the main tissue of our nervous system. Ø Number of xylem and phloem strands varies from 6 to many (hexarch to polyarch). 13. 9. Draw well labelled diagram. At the time of secondary growth many-layered cambium (meristematic tissue) develops outside the primary bundles in the parenchyma. Draw well labelled diagrams of various types of muscles found in human body. The outline of T.S. Sometimes they develop chlorophyll. (iv) Name the stage that comes just after the stage shown in the diagram. reveals the following tissues from outside within: It is circular in outline with a well-defined epidermis, hypodermis, ground tissue system and many scattered vascular bundles. Five vascular bundles of outer ring are present opposite the ridges whereas the remaining five of the inner ring face the furrows. 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. The upper epidermis has some cells larger than the others; such large cells are known as. 13. Phellogen cuts off cells on both sides. 3. Cambium is present in between secondary phloem and secondary xylem. 3. 4. (3 Marks) Or. Cambium develops secondarily from the pericycle and becomes active. Ø Meta-xylem elements are circular in outline in the cross section. asked Feb 6, 2018 in Class IX Science by navnit40 ( … ... S can be xylem, Q can be blood and U can be parenchyma. upper and lower epidermis; palisade mesophyll under upper epidermis; 3 to 1; 2 of leaf thickness; done clear. It is thin-walled and parenchymatous. Intruded furrows (four) of secondary phloem are arranged in the form of a cross. Ten vascular bundles are arranged in two rows of five each. Draw a well labelled diagram of xylem. Phloem fibres are absent. Each vascular bundle is conjoint, collateral, closed and endarch. (a) 1. (b) Intercellular spaces are absent in sclerenchymatous tissues. Presence of sclerenchymatous patches in the ground tissue. asked Jul 16 in Biology by KomalKumari (48.8k points) tissues; class-9; 0 votes. 16. 14. Vascular bundles are conjoint, bicollateral, open and endarch. Single-layered epidermis consists of small, radially elongated cells. Question 52. It monitors and regulates the functions of the body. (a) 1. In Bignonia unguis-catae, bars of sclerenchyma are present in the furrows of secondary phloem. Presence of vessels in the xylem…………….. Angiosperms, (b) 1. 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. Each vascular bundle is covered by incomplete, sclerenchymatous bundle sheath. It is not differentiated into cortex, endodermis, pericycle and pith. 13. Secondary phloem is present in the form of a continuous ring and consists of sieve tubes, companion cells and phloem parenchyma. Due to the irregular activity of the cambium at certain places, the secondary phloem is formed towards inner side instead of secondary xylem. Presence of vessels in the xylem………… Angiosperms, (b) 1. Share Your PDF File The mesophyll is not differentiated into palisade and spongy parenchyma. Nervous or the nerve tissue is the main tissue of our nervous system. 3. Our mission is to provide an online platform to help students to share notes in Biology. Even though plant and animal cells are eukaryotic and share a few cell organelles, plant cells are quite distinct when compared to animal cells as they perform different functions. Cambium or meristematic tissue cuts many secondary vascular bundles only towards inner side. Each vascular bundle is made up of phloem and xylem. 13. Many patches of interxylary phloem or included phloem are present in the secondary xylem cylinder. Monocot roots, interestingly, have their vascular bundles arranged in a ring. 6. Outermost ring of the vascular bundles contain inter-fascicular cambium which is absent in other two rings. Xylem fibres or wood fibres are mainly of two types: fibre-traeheids (Fig. Stem, 2. Xylem fibres provide mechanical strength to the plant body. 17. Award 1 for each structure clearly drawn and correctly labelled. Stomata are found on both upper and lower epidermal layers. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. 18. A big zone of pericycle is present below the endodermis consisting of parenchymatous cells. i. Middle ring consists of 6-14 small vascular bundles. A thick cuticle covers the outer wall of the cells of epidermis. 17. Xylem parenchyma are the only living components of xylem. Sclerenchyma patches remain attached with the chlorenchyma. In dicot stem intra fascicular cambium is present. 2. 9. 15. Secondary bundles are peripheral in position, small in size, oval in transection and amphivasal, i.e., phloem is surrounded by xylem. Sclerenchyma provides mechanical strength to the plants. Chlorenchyma is present inner to collenchyma in the form of 3 to 7 layers. asked Jul 16 in Biology by KomalKumari (48.8k points) tissues; class-9; 0 votes. (g) Xylem transports _____ and _____ from soil. Multicellular epidermal hair ………..Stem. Share Your PPT File. Some times a few neighbouring epidermal cells in vicinity of guard cells become specialized in their shape and size and contents. 3. (iii) The outer parts of the phloem, which is broken and disorganized, is called protophloem. 12. Xylem consists of wide vessels present on the outer side representing the metaxylem and narrow vessels present towards inner side representing the protoxylem. The cells are filled with starch grains and lack casparian strips. Vascular bundles are conjoint, collateral, open and endarch ………………Stem. The cells are small and compactly arranged below the hypodermis but they are large, round and loosely arranged in the centre. Formation of four furrows of secondary phloem in the secondary xylem is due to the abnormal functioning of cambium which was behaving normally sometime earlier. It is rarely complete. It is mainly concerned with the conduction of water and minerals. 16. Chlorenchymatous cells are thin-walled, oval, full of chloroplasts and enclose many intercellular spaces. Vascular bundles are conjoint, collateral and endarch. Yeast: Origin, Reproduction, Life Cycle and Growth Requirements | Industrial Microbiology, How is Bread Made Step by Step? 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