CBSE Class 9 Science Tissues Notes

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The body of plants and animals is made up of different types of cells. These cells originate from a single cell by repeated divisions and get differentiated during development. In unicellular organisms all the body functions are performed by a single cell. But in multicellular organisms, different functions are performed by different groups of cells. The groups of cells having a common origin and performing similar functions are called tissues. Several tissues are organized to form tissue system and the tissue systems form the organs and several organs into organism.


Study of tissues is called Histology

Tissue and Division of Labour: In complex organisms, different tasks are carried out by different organs and organ systems. Tissues are the first step towards division of labour in complex organisms.


Q1. What is a tissue?

Answer: A group of cells that are similar in structure and/or work together to achieve a particular function is called tissue.

Q2. What is the utility of tissues in multi-cellular organisms?

Answer: In multicellular organisms, the body system is based on the division of labour. It means the cells performing a specific function are grouped together to form a particular tissue.

The different tissues are organized in a way to provide highest efficiency in functioning of the body.


Plant tissues are of two main types, viz. meristematic tissue and permanent tissue.


The growth of plants occurs only in certain specific regions. This is because the dividing tissue also known as meristematic tissue (Meristos – divisible) is located only at these points.

The meristematic tissues are made up of group of similar and immature cells, which can divide and form new cells. Meristematic cells divide continuously and thus help in increasing the length and thickness of the plant. Depending upon the position, meristematic tissues are of three types. 

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