CBSE Class 9 Science Chapter 6 - Tissues Class 9 Notes

Tissues Class 9 Revision Notes

This article deals with tissues class 9 notes. First of all, all living organisms are formed of cells. Furthermore, a single cell in a unicellular organism can perform all the basic functions. An example can be of an amoeba, where a single cell carries out all the movements. However, multicellular organisms contain millions of cells. Moreover, such cells carry out specific functions. Each such special function is taken up by a specific group of cells. This procedure is very efficient since these cells control only a specific function. Most noteworthy, in human beings, contraction and relaxation of muscles take place to result in movement. Also, blood transports oxygen while nerve cells carry messages.

A tissue refers to a group of cells that are similar in functions and structure. Furthermore, there are two main types of plant tissues. These two types are meristematic and permanent. Moreover, meristematic tissue happens to be the dividing tissue that exists in a plant’s growing regions. On the other hand, permanent tissues come from meristematic tissues when they lose the dividing ability. Experts classify permanent tissues as simple and complex tissues. Also, the three main types of simple tissue are parenchyma, collenchyma, and sclerenchyma. Animal tissues can be connective, epithelial, muscular, and nervous tissue.

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Sub-topics covered under Tissues

Introduction to Tissues – Tissue refers to a cellular organizational level between cells and complete organs.

Meristematic Tissue – Meristematic tissue occurs in many plants which consist of undifferentiated cells.
Permanent Tissue – Permanent tissues are those that have lost the cell division power.
Epithelial Tissue – Epithelial tissue line the outer and inner surfaces of blood vessels and organs.
Connective Tissues – Connective tissues are those which connect, separate, bind, and support various organs and tissues.
Muscular and Nervous Tissues– Muscular tissue comprises muscles while nervous tissue comprises neurons in animal bodies.

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