2. Group of cells having a common origin, similarGroup of cells having a common origin, similar
or related structure which work together toor related structure which work together to
perform a common function is called tissue.perform a common function is called tissue.
Study of tissues is called histologyStudy of tissues is called histology
3. IMPORTANCE OF TISSUESIMPORTANCE OF TISSUES
• Formation of tissues has brought about divison ofFormation of tissues has brought about divison of
Labour in multicellular organismsLabour in multicellular organisms
•Tissues become organised to form organs &organ systemTissues become organised to form organs &organ system
•Workload of individual cells has decreasedWorkload of individual cells has decreased
4. Both plants and animals have similar lifeBoth plants and animals have similar life
processes .However they do not have similar types ofprocesses .However they do not have similar types of
tissues because of the differences in their organisation ,tissues because of the differences in their organisation ,
mode of living and lifestyle. Plants and animals aremode of living and lifestyle. Plants and animals are
not made of same type of tissues -not made of same type of tissues -
GrowthGrowth
MobilityMobility
Structural organisationStructural organisation
5. Plant tissuesPlant tissues
Plant tissues is of two types ,meristematic and permanentPlant tissues is of two types ,meristematic and permanent
plant tissues. Meristematic tissues is of three types –plant tissues. Meristematic tissues is of three types –
Apical , Intercalary and Lateral MeristamApical , Intercalary and Lateral Meristam
Permanent tissues are of two types-Permanent tissues are of two types-
Simple permanent and complex permanent tissueSimple permanent and complex permanent tissue
6. Meristematic tissueMeristematic tissue
It is a plant tissue of thin walled compactly arrangedIt is a plant tissue of thin walled compactly arranged
In mature cell that have the potential to divide andIn mature cell that have the potential to divide and
From new cell . Meristematic tissue is also calledFrom new cell . Meristematic tissue is also called
meristem. Its cells are called meristematic cells .Themeristem. Its cells are called meristematic cells .The
region where meristem is present can function asregion where meristem is present can function as
growth region. New cells produced by a meristemgrowth region. New cells produced by a meristem
Are initally like meristmatic cell . Slowly they growAre initally like meristmatic cell . Slowly they grow
Differentiate and mature into component of variusDifferentiate and mature into component of varius
Permanent tissues.Permanent tissues.
7. Permanent tissuePermanent tissue
They are plant tissue where the cells have lost the ability toThey are plant tissue where the cells have lost the ability to
divide and have assumed a permanent shape,size and function.divide and have assumed a permanent shape,size and function.
They are derived from meristematic cells. The process of takingThey are derived from meristematic cells. The process of taking
up a definite shape, size, structure and function is calledup a definite shape, size, structure and function is called
differentiation. Different types of permanent tissues aredifferentiation. Different types of permanent tissues are
formed due to differences in their specialisation. Permanentformed due to differences in their specialisation. Permanent
tissue may be simple ,Complex or Special .their cells maytissue may be simple ,Complex or Special .their cells may
beliving or dead, thin walled or thickWalled. Thickeningbeliving or dead, thin walled or thickWalled. Thickening
may be regular or irregularmay be regular or irregular
