Chap 6 TISSUE Science NCERT CLASS 9 Notes

 Chapter 6 

Tissue 

This article brings you the CBSE Class 9 Science notes on chapter 6 'TISSUE '. These chapter notes are prepared by the subject expert and cover every important topic from the chapter. In between these notes, questions are provided. Students must solve these questions to test their understanding about the learned topics. These questions will help you to track your preparation level and get a hold on the subject. 

In this chapter 6'TISSUE'we cover following topics -

Tissue

Plant Tissue and it's types

Meristems

Types of Meristems 

Permanent Tissue  and it's types

Animal Tissue and it's classification

Muscular Tissue 

Nervous Tissue

Important Notes Of CHAPTER 6 'Tissue' of CLASS 9 SCIENCE NCERT for 2020-21.

•Tissue:- Tissue is a group of cell having similar origin, structure and function. Study of tissue is called histology.

In unicellular organism(amoeba) single cell performs all basic functions, whereas in multicellular organism(plants and animals) show division of later as plant tissue and animals tissue.

• Plant tissue are two types:- Meristems and permanent tissue.

1)Meristems:- The meristem are the tissue having the power of all division. It is found on these region of the plant which grows.

•Types of Meristem:-

a)The Apical Meristem:- It is present at the growing tips of the stems and roots and increase the length.

b)The Lateral Meristem:- It is present at the lateral side of the stem and rest (cambium) and increases the girth.

c)The intercalary Meristem:- Present at internodes or base of the leaves and increase the length between the nodes.

2) Permanent Tissue:- It is of two types simple permanent tissue and complex permanent tissue.

a)Simple Permanent Tissue:- it is subdivided as:-

I)Parenchyma:- Tissue provided the support to plants. They are loosely  packed and has large intercellular space.

• Parenchyma with chlorophyll which perform photosynthesis  is called as chlorenchyma.

• The parenchyma with large air space to give buoyancy is called as arenchyma. Parenchyma also stores food and water.

II)Collenchyma:- Tissue provide mechanical support thickened  at the corners have very little intercellular space it allows easy bending of  various parts of a plant without breaking.

III) Sclerenchyma:- Tissues make the plant hard  and stiff thickened due to lignin and no inter cellular space. Cells  of this tissues are dead and commonly seen in the husk of coconut.

iv)Gaurd cell and epidermal tissues:-The tissue aids in the protection and exchange of gases.Gaurd cell kidney shaped in dicots, dumb cell shaped in monocots to gaurd the stomata.The epidermal tissue of roots in absorbtion of water and minerals.The epidermal tissues in desert plants have a thick waxey coating of lutin with waterproof quality .The epidermal tissues from the several layer thick cork or the bark of the tree.

(b)Complex permanent tissue-The complex tissues are exists of more than one type of cell.All these cells coordinate to perform a common function.

They are subdivided as:-

i)Xylem:-It consists of trachieds, vessels, xylem parenchyma and xylem fibres-The cell have thick walls.

Function:-aids in construction of water and minerals.

ii)Phloem-It consists of tubes, companion cells, phloem parenchyma and phloem fibres.

Function:-Phloem transports food material to other part of the plants.

7)Animal tissue-Sub divided as epithelial tissue,connective tissue,muscular tissue and nervous tissue.

i)Epithelial tissue-It is protective covering forming a continous sheet simple epithelium is the one which is extremely then in one layer whereas stratified epithelium are arranged in patterns of layer.

Depending on shape and functions they are classified as:-

A)Squamous epithelium in the lining of mouth and esophagus.

B)Cuboidal epithelium in the lining of kidney tubules and salivary gland.

C)Columnar epithelium in the intestive and columnar epithelium with cilia in the lining of respiratory tract.

D)Glandular epithelium in the glands aids in a special functions as gland cells which can secreath at epithelial surface.

Connective tissue-five types such as:-

A)Blood=The blood is a fluid connective tissue plotid plasma has RBC=(red blood cell) WBCs(white blood cells) and platelets.Blood plasma contains proteins,salts and harmones.Blood flows and transport gases,digestive food, harmones and waste material.

B)Bones=The bone is a connective tissue with hard matrix, composed of calcium and phosphorus a bone is connected by another bones with another connective tissue called ligaments a bone is connected by muscles with another connective tissue called tendon.

C)Cartilage=The cartilage is a connective tissue with solid matrix composed of protein and sugar it is commonly seen in nose,ear,trachea and larynx.

D)Areolar connective tissue=It is found between the skin and muscles around the blood vessels.It support enternal organs and aids in repairs of tissues.

E)Adipose connective tissues-it is found with fat gloules fan the storage of fats it acts as insulates.

8)Muscular tissues=They have special contractile protiens responsible for movement.Three types such as:-

-Striated muscle/skeletal muscle/voluntary muscles

They are cylindercal, un-branched and multinucleated. They have dark bands and light bands.

-Unstriated muscles/smooth muscles/involuntary muscle

They are commonly called as smooth muscles,having no striations(dark bands/light bands are absent) commonly found alimentary canal, uterus, iris of an eye.They are spindle shaped.Involuntary in nature.

Cardiac muscles=They are commonly called as heart muscles,cylinderical, branched and uni-nucleates.Involuntary in nature.

9)Nervous tissue-The tissue respond to stimuli.The brain,spinal cord and nerves are composed of nervous tissue or neurons.A neuron consists of cell body,cytoplasm, nucleus, dentrine, axon, nerve ending.The neuron impulse allow us to move or muscles whom we want to  respond to stimuli.

Try Question Answer:-

Ques 1.Which structure protect the plant body against invasion of particles?

Ques 2. Why does the skin of your finger shrink when you wash clothes for a long time?

Ques 3. Why is endo cytosis found in animals only?

Ques 4. Why are lysosomes known as SUICIDAL BAG OF A CELL?

These are the complete notes of CHAPTER 6 TISSUE OF SCIENCE NCERT CLASS 9. Hope these notes helpful to better understand the CHAP 6 TISSUE.

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