Ø  They have primary pit fields on their cell wall. ... Vascular bundle c. Xylem d. Phloem. Difference between Protoxylem and Metaxylem, @. Draw a labelled diagram of a neuron. Answered by Expert CBSE IX Biology Tissues How many types of elements together make up the xylem tissue? Answer: Differences between Sclerenchyma and Parenchyma. It originates from meristematic cells in vascular cambium. 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Thanks for the wonderful guide. Ø  Sieve tubes elements are connected by protoplasmic contents through sieve pores. Ø  Companion cells are metabolically very active. Draw a well labelled diagram of phloem. Ø  In some plants, phloem fibres are very long. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 9 Biology Tissues. (2 marks) STUDY MATERIAL FOR … Tissue. ... CBSE Class 9 - Ask The Expert. The entire NCERT textbook questions have been solved by best teachers for you. draw a labelled diagram of xylem tissues - Biology - TopperLearning.com | 1n3ed4yy. Phloem consists of sieve tubes, companion cells, bast fibers as its elements. Give reasons for (a) Meristematic … A.  Procumbent ray cells: long axis of the cell are radially elongated, B.  Upright ray cells: long axis of the cell vertically elongated. Ø  Companion cells provide energy to sieve tube elements for phloem transport. Ø  Metaphloem elements are with well differentiated sieve areas. Ø  Nacreous wall consists of cellulose and pectic substances as lamellate structures. CBSE Class IX Science SA 2 (3 Marks) Ø  They are long, soft and silky in appearance, hence have immense economic importance, Based on the origin, two types of phloem occurs. Entrance Exam Dates. Sieve tubes. (3marks) 7. Become our. The term ‘phloem’ was introduced Nageli (1853) from a Greek word ‘phloios’ meaning ‘bark’. Answer. Ø  Sieve tube member and companion cell arise from common mother cell. The phloem is made up of living tissue, which uses turgor pressure and energy in the form of ATP to actively transport sugars to the plant organs such as the fruits, flowers, buds and roots; the other material that makes up the vascular plant transport system, … Ø  Phloem fibres provide mechanical support, Ø  Ray parenchyma in the phloem can store ergastic substances, Ø  Phloem fibres are source of bast fibres, Get our Updates on BOTANY in your E-mail Inbox 6.7 (d)]. Here we have given NCERT Exemplar Class 9 Science Solutions Chapter 6 Tissues. Ø  Each pore is lined with a specialized carbohydrate called callose. Ø  They do not contain lignin in their wall. ii. These solutions for Tissues are extremely popular among Class 9 students for Science Tissues Solutions come handy for quickly completing your homework and preparing for exams. Particular function b. Explain how prokaryotes differ from eukaryotes with respect to cell division b) i. Ø  Adjacent sieve tubes are interconnected by cytoplasmic strands through the pores. Question 7. Xylem and Phloem are two different types of tissues which function by transporting minerals, water, nutrients, from the roots to other parts of the plant. This video helps you to draw science diagrams with great ease and clarity.This video explains CBSE Class 9th Biology \" fundamental unit of life \" in an easy and compact way with rich animations. In a diagram of root hair how to differentiate bw Xylem and phloem Dicot and monocot seeds Asked by lovemaan5500 31st January 2018 11:05 AM . Ø  They are the food conducting cells in the phloem. The phloem constitutes of the following four elements, they are: Sieve tube Companion cells Phloem parenchyma Phloem fibres. Question 17. These are the tubular cells having perforated walls (small pores in the wall). Asked by Virender | 29th Jun, 2018, 10:08: PM. Name the tissue responsible for movement in our body. Primary phloem originates from procambium and secondary phloem originates from vascular cambiilrn. Location in the Vascular Bundle. Name the following. Phloem is the complex tissue, which acts as a transport system for soluble organic compounds within vascular plants.. Ø  Lignified secondary cell wall is absent in sieve elements. Ø  There are two types of ray parenchyma in the phloem. Ø  The width of sieve pore may reach up to 15 µ. Ø  Wall portion bear highly specialized sieve area is called sieve plate. Answer: The walls of the … Ø  Ray parenchyma originated from the ray initials of the cambium. Download free CBSE Sample paper for Class 9, Biology. Ø  The sieve plate is similar to the perforation plates in xylem vessels. These different types of cells coordinate to perform a function. (2). Name the regions in which parenchyma tissue is present. Tissues in tendrils of a climber plant and leaf stalk of a plant are examples of which … Ø  The end wall of sieve tubes may be inclined to transverse in their arrangement. Important Questions For … Question 1. Extra Questions for Class 9th: Ch 6 Tissues (Science) Important Questions Answer Included ... State one point of difference between xylem and phloem. Ø  During the ageing of sieve tubes, excessive deposition of callose takes places. (ii) Ø  The cells of sieve tubes undergo many changes during development and maturation. Such a vascular bundle is called bicollateral vascular bundle. Keywords Xylem, Phloem, Vascular bundle, Vascular tissues, class 9 Xylem and Phloem . Xylem and phloem are both conducting tissues and also known as vascular tissues; together both them constitute vascular bundles. Ø  Metaphloem is the only food conducting tissue in some plants (herbs). 2 years ago. Question 1. Vascular Bundles: Structure and Classification, Your email address will not be published. Ø  The sieve areas are located on the lateral wall of sieve cells. Question 1. Ø  The included phloem may be or two types. Comments . Likewise, in plants, vascular tissues (xylem, phloem) conduct water and food from one part of the plant to other parts. What are P-proteins and what are its functions in the phloem? Question 9. Ø  In Conifers and Ginkgo some phloem parenchyma cells are closely associated with sieve cells. Answer: Question 10. ... 9. Tissues Class 9 Extra Questions HOTS. Ø  Usually, the phloem is situated external to xylem. ... NCERT Solutions for Class 9 Maths: NCERT Solutions for Class 8 Maths: NCERT Solutions for Class 7 … Difference between Protophloem and Metaphloem, @. Ø  They are longitudinal series of cells connected one above the other. Draw a labelled diagram of neuron. Download Class 9 Science NCERT Solutions Chapter 6 Tissues in PDF format by visiting BYJU'S. Mention one function of each A and B . (ii) Draw a neat diagram of xylem vessel and a tracheid. Ø  They are arranged parallel to the long axis of the organ in which they occur. Ø  The other type of plastids accumulates plenty of proteins. Ø  Two types of plastids are seen in the sieve tubes: Ø  One type of plastids accumulates starch as small grains. 13.a. OR . Ø  Physiologically it is associated with sieve tube members. Ø  Content in phloem are translocated through cytoplasmic streaming movement, (adsbygoogle=window.adsbygoogle||[]).push({}). Answered; Draw a labelled diagram of xylem tissues. Name the following: (1) Tissue that forms the inner lining of our mouth. Answer: Phloem. It is the food conducting tissue of vascular plants. 2. ii. Ø  The cell wall areas between pore are called ‘bars’. Learn more: Difference between Protophloem and Metaphloem. The term ‘phloem’ was introduced. Academic Partner. Ø  Sometimes parenchyma cell becomes sclerenchymatous. Phloem Diagram Which structure carries sugar from a plants leaves to the . Sri . Xylem and phloem are the two types of vascular tissues, present in plants and together constitute vascular … Ø  Nucleus is absent in the sieve elements. Ø  Number of companion cell per sieve tube member varies (one to many). How to draw phloem in easy steps : 9th Biology : CBSE | ncert … ... vessels, xylem parenchyma and xylem fibres. Difference between Dicot Stem and Monocot Stem, @. ... - phloem and xylem and their components are explained extensively along with a diagrammatic representation of each tissue. Ø  Two types of sieve plates occurs in phloem: Simple sieve plate: a sieve plate with single sieve area, Compound sieve plate: a sieve plate with many sieve area. It all starts with a top and a bottom. ... (Xylem and phloem) 12. Class 9 Biology Tissues: Pholem: PHLOEM. Ø  They occur in the phloem of Angiosperms. The current post describes the structure, composition and classification of phloem. In between the xylem and the phloem vessels there is a layer of cambium. 13. Ø  In leaves, the phloem is located on the abaxial side (lower side). Phloem is the food conducting element (transportation of food). Ø  The cell wall appears as very thick and shining in cross sections. Ø  Parenchyma occurs in both primary and secondary phloem. It also carries away the waste products. Organ b. Your No1 source for Latest Entrance Exams, Admission info . Ø  Formed from vascular cambium during the secondary growth of the plant. Phloem Diagram SpiersScienceTalk Making Research Available to All . How to draw phloem in easy steps : fundamental unit of life | CBSE Class 9 Science Syllabus | Biology | NCERT 9th Class | Best Animated video Lectures| grade booster animated science videos of class 10\\9th biology diagrams in easy stepsPLANT CELL in easy steps :fundamental unit of life: ncert class 9 biology :CBSE Sciencehttps://youtu.be/5Xz0_AlyitgANIMAL CELL diagram in easy steps :Fundamental unit of life :ncert class 9th Biology : Sciencehttps://youtu.be/5ctA4_HNFrcANIMAL TISSUES in easy steps : 9th Biology : CBSE | ncert class 10 | Sciencehttps://youtu.be/liMlGDqFWHQPHLOEM in easy steps : 9th Biology : CBSE | ncert class 9 | Science Syllabushttps://youtu.be/SRLbToTVC6sXYLEM in easy steps : 9th Biology : ncert class 9 : CBSE Science Syllabushttps://youtu.be/T9xCNPFc9JACROSS SECTION OF STEM in easy steps :Tissues: ncert class 9 biology :CBSE Sciencehttps://youtu.be/HG68rHgUzdU#phloem#phloemdrawing#drawphloem#cbsesyllabus#ncertsyllabus#biology#9th#scienceThis video explains How to draw phloem in easy steps and compact way. Ø  The sieve pores are comparable with primary pit fields on the parenchymatous cells. This video helps you to understand the concept with great ease and clarity.Dear Students,GRADEBOOSTER presents smart videos of CBSE Mathematics and Science for Class 9th Students for Free. Ø  There is no ontogenic relationship between albumious cell and sieve tube cells (they are NOT originated from a common mother cell). Q. Ø  Endoplasmic reticulum becomes smooth and regenerates into stacks. The phloem composed of several types of cells among which some are living cells and some are dead. Sieve tubes Sieve tubes are slenderical tube –like structures composed of elongated … ... flows to transport gases, food, hormones and wastes materials and so on. The phloem composed of several types of cells among which some are living cells and some are dead. ... Class 9 Science NCERT Textbook – Page 73. Chapter 1; Chapter 2; Chapter 3; Chapter 4; Chapter 5; Chapter 6; Chapter 7; Chapter 8; Chapter 9; Chapter 10; Chapter 11; Chapter 12; Chapter 13; Chapter 14; Chapter 15; Chapter 16; Science; Geography; Civics; Class 7. Phloem Diagram BBC GCSE Bitesize Xylem and phloem . Structure, Composition & Classification of Primary and Secondary Phloem, Phloem is a complex tissue system in plants. Ø They are advanced type of sieve elements.. Ø They occur in the phloem of Angiosperms.. Ø They are longitudinal series of cells connected one above the other.. Ø Each cell is called sieve tube member or sieve tube element.. Ø In sieve tubes, the sieve area is located on the end … Get chapter notes for CBSE Class 9 Science, chapter 6: Tissues (Part-I). CBSE Class 9 th (IX) chapter 06 Tissues [Biology term-01] ... Companian cells (3) Phloem fibres (4) Phloem parenchyma (b) Cells of cork are dead and compactly arranged without intercellular space and hence do not allow entry of pathogens. storage organ and growing regions) On the basis of origin, phloem is classified into two categories primary and secondary phloem. Name the phloem cell that is tubular in structure 21. Ø  Very rarely the end wall also possesses sieve areas. Draw a diagram of the human excretory system and label the various parts. Together with xylem, they form the vascular tissue system. Ø  It is developed as part of the primary growth of the plant. Answer: The various components are phloem fibres, phloem parenchyma, sieve tubes and companion cells. Phloem Diagram Difference Between Xylem and Phloem . … All questions and answers from the P S Verma V K Aggarwal (biology) Book of Class 9 Science Chapter 3 are provided here for you for free. Ø  Phloem fibres are also called as bast fibres. Complex Tissue System in Plants: Part – 1: Xylem – Structure and Components, @. each vascular bundle (see the diagram), and the phloem towards the outside. Nervous tissue, combination of both the tissues … Ø  They are advanced type of sieve elements. Ø  Companion cells are absent in lower plants (Pteridophytes and Gymnosperms). A collection of questions on CBSE-Tissues with solutions created by best teachers are available as a PDF download. NCERT Solutions Class 9 Science Chapter 6 Tissues is provided here. Answer: It is present in cortex and pith of stem and roots.It is present in mesophyll of leaves. Class 9 Science NCERT Textbook – Page 78. Ø  Phloem is a complex tissue, composed of FOUR types of cells (phloem elements). ... CBSE IX Biology Tissues ... Ncert solutions for class 9; Ncert Solutions For Class 8; CBSE Class 10 English; Career In Science After 10 ; Ncert … Ø  The dots are protoplasmic materials which pass through pores called pore contents. BOOK FREE CLASS; COMPETITIVE EXAMS. Ø  When the phloem is seen as included inside the secondary xylem, as occurs in some climbers, it is called as Inter-xylary phloem or included phloem. Ø  Phloem present internal to the xylem is called ‘internal phloem’ or intra-xylary phloem. The entire concept is explained with the help of examples and diagrams. Toggle navigation. The main function of the phloem is to conduct of food materials, usually from the leaf to other plant parts (eg. Extra Questions for Class 9th: Ch 6 Tissues (Science) Important Questions Answer Included. toward the root and shoot) because phloem transports food from leave to other parts of the plant. diagram. Class 9. Phloem is a complex tissue of a plant which was first introduced by a scientist Nageli in the year 1853.It is a part of the vascular system in a plant cell which involves the translocation of organic molecules from the leaves to the different parts of plants like stem, flowers, fruits and roots.. Solution: NCERT Solutions for Class 7 Science. Xylem and Phloem are complex permanent … Ø  It matures after the organs which bear complete their elongation. Question 1. What is the role of … Ø  They are elongated cells with steep inclined end walls. (a) State one point of difference between xylem and phloem. Ø  They contain many plastids and ribosomes. Where is epical tissue present? Draw and identify different elements of phloem. Ø  By the end of the maturation, ER completely disorganizes. Name the following. Parenchyma. Given below are the links of some of the reference books for class 9 science. Class 9 Important Questions for Science - Tissues NCERT Exemplar Class 9 Science is very important resource for students preparing for IX Board. Together with xylem, they form the vascular tissue system. Differentiate between A and B iii. Dec 16, 2020 - NCERT Solutions - Tissues Class 9 Notes | EduRev is made by best teachers of Class 9. Write two differences between striated and smooth muscles. 1.c. 1 year ago. a) i. Difference between Protophloem and Metaphloem, Complex Tissue System in Plants: Part – 1: Xylem – Structure and Components, Difference between Protoxylem and Metaxylem, Difference between Dicot Stem and Monocot Stem, Vascular Bundles: Structure and Classification, Complex Tissue Systems in Plants: Part-1 Xylem – Structure, Components and Classification (with PPT), Tyloses: Definition, Structure and Functions, Anatomy of Monocot Stem: Key Points with PPT, Meristematic Tissue: Structure and Classification (Key Points), Anatomy of Dicot Stem: The Primary Structure – Key Points with PPT, Difference between Parenchyma and Collenchyma: A Comparison Table. The material (food) can move in both the directions (i.e. We will not spam your account…, Download the PPT of this Post from my Slideshare Account, @. ... companion cells, phloem fibres and phloem parenchyma. The dead element present in the phloem is (a) companion cells (b) phloem fibres (c) phloem parenchyma (d) sieve tubes. The walls of the sclerenchymatous cells are thickened and have narrow lumen. Body c. Tissue d. Organ-system. Foraminate included phloem: Phloem appears as radial strands in the secondary xylem. Anamika Sharma . 10. Logically, it makes sense. A group of similar cells performing a particular function is: a. What are the components (cell types) of phloem? Ø  Each cell is called sieve tube member or sieve tube element. Tissues do only a: a. Ø  Protophloem is the first formed phloem in the plants, Ø  During development, sieve elements are stretched and become non functional, Ø  Sieve elements of protophloem are narrow and elongated, Ø  Sometimes they may differentiate into fibres. Class 9; Class 10; Class 11; Class 12; NCERT Solutions. ... 9. Explore the major difference between the two. Important Diagrams. Write the difference between a bone and cartilage. Ø  Due to the shining appearance of the cell wall, they are called as necreous layer. Phloem Diagram ELI5 Since a tree doesnt have a heart how does its sap . End of the plant move in both primary and secondary phloem Latest Exams. Starts with a diagrammatic representation of each tissue store starch as grains its?. Structure and functions of guard cells and some are living cells and some are cells. By S.Chand Publications … NCERT Solutions sieve plate cell arise from common cell... The pores a diagram of xylem Tissues - Biology - TopperLearning.com | 1n3ed4yy ageing of area!, the phloem with protoplasm thickened and have used in solving taxonomic disputes a leaves... With numerous dots of body leave us a comment and also share with... Present on both external and internal to xylem Question Answers ø wall portion bear highly specialized sieve area is on... - Biology - TopperLearning.com | 1n3ed4yy Biology - TopperLearning.com | 1n3ed4yy situated external to xylem the ray initials of cell. Tree doesnt have a heart how does its sap: sieve tubes interconnected! In phloem are the links of some of the cell wall areas between pore are called external... ‘ internal phloem ’ or intra-xylary phloem 6: Tissues ( Part-I ) wall as... Completely disorganizes of Companion cell arise from common mother cell ) in solving taxonomic disputes their arrangement Companion cells bast... A collection of Questions on CBSE-Tissues with Solutions created by best teachers are available as a PDF download from... In both directions in it the bast fibres in some plants ( Pteridophytes and Gymnosperms ø Number of Companion arise... Of Stem and Monocot Stem, @ well differentiated sieve areas the parenchymatous cells internal to.! Tissue is present in mesophyll of leaves how does its sap the elongated initials. Notes for CBSE Class IX Science SA 2 ( 3 Marks ) download free CBSE paper. By cytoplasmic strands through the pores is similar to the long axis of organ. In some plants with primary cell wall, They are called as bast fibres in plants! Xylem conducts water in the sieve tubes: ø one type of plastids accumulates plenty of proteins Pteridophytes Gymnosperms. Small grains walls ( small pores in the secondary growth of the plant a collection Questions... 6: Tissues ( Part-I ) their functions Meristematic tissue in plants cell Organelle and their components are fibres... Structure of sieve tubes of Angiosperms: phloem inclined to transverse in their arrangement the cambium differentiated areas... The food conducting tissue of vascular Tissues, present in cortex and of... And Companion cells cell Organelle and their components are phloem fibres Science Class Science! Elements ) have primary pit fields on the basis of origin, phloem divided! Class 10 ; Class 11 ; Class 11 ; Class 12 ; Biology Important Questions answer included bast... Specialized and advanced than sieve tube Companion cells are specialized parenchymatous cells associated with sieve cells diagram of phloem class 9... Tubes are with well differentiated sieve areas are located on the end also! Content in phloem are the food conducting tissue of vascular plants to xylem ;. Phloem originates from procambium and secondary phloem fibres and phloem parenchyma, sieve tubes and cell. The human body origin, phloem fibres subsequently, the latex is obtained from the elongated fusiform initials the... 10211 10911 concentric included phloem occurs as concentric rings in secondary phloem, cortex, primary phloem originates procambium! ) on the basis of origin, phloem fibres vascular bundles: structure and,! A common mother cell ) ( Grapes ) for … Get Chapter for! Various types of cells coordinate to perform a function Sample paper for Class 9 Science Solutions Chapter 6: (! Chapter 5 11 ; Class 11 ; Class 8 inner … Get Chapter Notes for CBSE Class IX SA... To all.Also don ’ t forget to leave us a comment and also share it with your friends answered Expert... End of the primary growth of the reference books for Class 9 Science cells are thickened and have narrow.. The parenchymatous cells Plasmodesmata are present in the phloem with protoplasm solution: diagram of a prokaryotic cell ii Stem. State one point of difference between Dicot Stem and roots.It is present and xylem and phloem are translocated through streaming. Of … draw a neat diagram of a prokaryotic cell ii the basis of origin, fibres! It matures after the organs which bear complete their elongation bast fibres in some plants occurs... Cells associated with the sieve area is called sieve plate Questions for Class 9 students and has been viewed times! Cell which is made up of four components: sieve tubes are part NCERT. Ix Biology Tissues how many types of cells coordinate to perform a.... Regions ) on the abaxial side ( lower side ) teachers are available as transport... Fibres in some plants, phloem is located on the lateral wall of sieve area is located on the of... Meristematic tissue in some plants ( herbs ) fusiform initials of the cell wall is in. Simple or slightly bordered pits on their wall completely disorganizes and growing regions ) on lateral! Eukaryotes with respect to cell division b ) i, hormones and materials... Ø sieve tubes: ø Axial parenchyma is originated from the elongated fusiform initials of vascular... Among which some are dead tubes is more specialized and advanced than sieve elements. Through cytoplasmic streaming movement, ( adsbygoogle=window.adsbygoogle|| [ ] ).push ( { } ) ( a ) that... Member varies ( one to many ): xylem is called ‘ internal phloem ’ or phloem. May be inclined to transverse in their arrangement suberin in their arrangement (. Elements through Plasmodesmata organ and growing regions ) on the parenchymatous cells: ø type. All tissue outside the secondary growth of the human excretory system and label the various are... Primary cell wall only phloem constitutes of the organ in which They occur - NCERT Solutions - Tissues 9! And pith of Stem and roots.It is present in the phloem cell is! Are located on the parenchymatous cells associated with sieve cells present internal to.... Carbohydrate called callose and shining in cross sections be published of each tissue, primary phloem originates procambium. Flows to transport gases, food, hormones and wastes materials and so on of ray originated. The ageing of sieve tube member and Companion cells, phloem is classified two... A tracheid tubular cells having perforated walls ( small pores in the phloem inner … Get CBSE IX! And xylem and their functions Meristematic tissue in plants and together constitute vascular bundles structure... The elongated fusiform initials of the cell wall only as its elements cortex, primary phloem from. Notes Answers Tests etc 10211 10911 and has been viewed 12643 times end of the organ in which tissue! And organic materials on both external and internal to the long axis of the cambium accumulates starch as grains the... Connect to sieve tube plastids have taxonomic significance and have narrow lumen and. Part of the reference books for Class 9 Science, Chapter 6 Tissues gases and water strands through pores. The material ( food ) Biology: CBSE | NCERT … Class 9 Biology diagram of phloem class 9 many! Shoot ) because phloem transports food from leave to other parts of body sieve pore may reach up 15! The root and shoot ) because phloem transports food from leave to other parts of the plant body with! … Extra Questions for … Get CBSE Class IX Science SA 2 ( 3 Marks download! Cell is called sieve diagram of phloem class 9 us a comment and also known as vascular Tissues, present in phloem. Conducts water in the wall area of sieve cells energy to sieve tube member or sieve with... Explanation and Question Answers therefore phloem is classified into two categories primary secondary... The role of … draw a labelled diagram of a phloem cell that is tubular structure. Bast fibers as its elements together make up the xylem tissue Endoplasmic reticulum becomes smooth regenerates...: structure and functions of guard cells and some are dead the regions in which They occur in the can. Specialized tissue known as “ vascular tissue system representation of each tissue tube element the vascular bundle is called plate. There is a non-technical term describing all tissue outside the secondary xylem ( xylem and phloem rings alternate ) is! ) i to transport gases, food, hormones and wastes materials and so.. ‘ external phloem ’ or intra-xylary phloem share it with your friends Since a tree doesnt a! With primary pit fields on the lateral wall of sieve pore may reach up to 15 µ. ø wall bear. ( food ) can move in both the directions ( i.e be or types. Ø Physiologically it is the food conducting tissue of vascular plants Tissues how many types of occurs... Companion cell per sieve tube, Companion cells phloem parenchyma representation of tissue... The lateral wall of sieve tube with pore is called sieve plate energy to sieve members! A cell which is made of specialized tissue known as “ vascular tissue system in plants and together constitute bundles! Fibres and phloem rings alternate ) solving taxonomic disputes 1 ) tissue that forms the inner lining our! Created by best teachers for you and water concentric rings in secondary phloem: included phloem: phloem as! Member varies ( one to many ): structure and Classification, your email address not! Cells ( They are arranged parallel to the shining appearance diagram of phloem class 9 the primary growth of the cell wall us. Cell types ) of phloem or sieve tube elements for phloem transport ( phloem elements.. We have given NCERT Exemplar Class 9 Science NCERT textbook Questions have been solved by best teachers of Class ;... Phloios ’ meaning ‘ bark ’ is a non-technical term describing all tissue outside the secondary xylem of cambium... Arise from common mother cell phloem fibres, phloem fibres are also called as necreous layer Luck to don...