CBSE Class 9 Science Tissues Notes

CBSE Class 9 Science Tissues Notes. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations.  Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.

TISSUES

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.

useful-resources-science-cbse-class-9-2

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.

INTEXT QUESTIONS

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

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

MERISTEMATIC 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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