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CBSE Notes for Class 9 Science chapter 6. Tissues: Epidermis, quick revision notes for Class 9 Science chapter 6. Tissues Epidermis, Chapter-wise CBSE Revision Notes, CBSE Notes PDF Free Download, CBSE One Liner Notes Class 9, Half Yearly Revision Notes, CBSE Revision Notes Class 9 Science
Get CBSE Notes for Class 9 Science Chapter 6. Tissues: Epidermis prepared by experts as per the latest NCERT syllabus and CBSE exam pattern. These concise and easy-to-understand notes cover important definitions, formulas, diagrams, and key concepts from the chapter to help students in quick revision and effective exam preparation. Whether you are studying for school tests, board exams, or competitive exams, these notes provide a reliable study resource. Designed in simple language with point-wise explanations, they save time and enhance learning efficiency. Download free PDF notes, explore solved examples, and strengthen your understanding of [Topic Name] for scoring high marks. Perfect for Class 9 students who want clear, structured, and exam-oriented notes for CBSE Science.
Epidermis:
The outer most layer of cells is called epidermis. The epidermis is usually made of a single layer of cells. The epidermis may thicker in plants of dry habitats.
Since, it has a protective role to play, cells of epidermal tissue form a continuous layer without intercellular spaces. Most epidermal cells are relatively flat. Often their outer and side walls are thicker than the inner wall.
Features:
(i) Epidermis may be thicker since protection against water loss is critical.
(ii) The entire surface of a plant has this outer covering of epidermis.
(iii) It protects all the parts of the plant.
(iv) Epidermal cells on the aerial parts of the plant often secrete a waxy, water-resistant layer on their outer surface.
(v) This aids in protection against loss of water, mechanical injury and invasion by parasitic fungi.
Functions Of Epidermis in plants:
(i) This aids in protection against loss of water,
(ii) Mechanical injury and invasion by parasitic fungi.
(iii) Its jelly like substances forms a water resistant layer.
Functions of Epidermis in roots:
Epidermal cells of the roots, whose function is water absorption, commonly bear
long hair-like parts that greatly increase the total absorptive surface area.
Role of Epidermis in Desert Plants:
Epidermis has a thick waxy coating of cutin (chemical substance with waterproof quality) on its outer surface.
Cutin: This is a chemical substance with waterproof quality, which is mainly found in epidermis of desert plants.
Suberin: There is a chemical called suberin in the walls of outer protective
tissue (thick cork) or the bark of the tree that makes them impervious (harmless) to gases and water.
Stomata: There are many small pores in the epidermis (surface) of the leaf. These small pores are called stomata.
Protective Layer: As plants grow older, the outer protective tissue undergoes certain changes. A strip of secondary meristem replaces the epidermis of the stem. Cells on the outside are cut off from this layer. This forms the several-layer thick cork or the bark of the tree. Cells of cork are dead and compactly arranged without intercellular spaces
Functions of stomata:
(i) The process of transpiration takes place through stomata.
(ii) The gaseous exchanges also take place through stomata.
Transpiration: This is a process of loss of water in the form of water vapour.
Function of guard Cells:
They are necessary for exchanging gases with the atmosphere.
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Ace your exams with CBSE Notes for Class 9 Science chapter 6. Tissues: Epidermis. These notes provide a clear explanation of important concepts, formulas, diagrams, and solved examples from the NCERT syllabus. Specially designed for Class 9 students, the notes are structured in a simple, point-wise manner to make revision quick and effective. Whether you are preparing for school tests, board exams, or competitive exams, these Science notes will boost your confidence and save valuable study time. You can also download Science class 9 chapter 6. Tissues free PDF notes for offline learning. With easy-to-grasp language, exam tips, and well-organized content, these CBSE Science notes on chapter 6. Tissues – Epidermis are the perfect study companion for scoring high marks and mastering the subject.
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