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Chapter: Biology: Division of Labour In Multicellular Plants : Tissue and Tissue System

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Types of Simple permanent tissue and its Functions

Types of Simple permanent tissue and its Functions
Tissues of same kinds compose simple tissue.

Simple tissueTissues of same kinds compose simple tissue. 

Simple tissues are of three types, namely

 

i. Parenchyma: Characteristics of parenchyma tissue are as follows:

 

·   Cells are almost uniform in length, breath and depth.

·   Cells are round, oval or polygonal in shape.

·   Cell wallls are evenly thick.

·   Cells are living and contain sufficientprotoplasm.


·           There may have intercellular spaces between adjacent cells

Permanent - tissues that Thin cell wall contain chlorophyll are called Chlorenchyma. The chlorenchyma ofleaf IS called Messophyll. Parenchymatous tissues with large air spaces In aquatic plants are Aerenchyma.

  


Functions:

Chlorenchyma manufactures food materials. They store reserve food.

They help ,in transporting the food materials. Parenchyma in the epidermis act as a defensive organ.

 

Position: Usually pith, pith rays, epidermis and most of the cortex are made ofthis tissue.

 

ii. Collenchyma: Characteristics of collenchyma tissues are asfollows:

 

·           Cells are to some extent elongated.

·           Cells are living with protoplasm.

·           Cell wall is unevenly thick, thickness is greater at eorners of the cells.

·           There may have intercellular spaces between adjacent cells

 

Functions:

·           Cells with chlorophyll manufacturefood.

·           It gives mechanical strength ' to the growmg organ.

Position: It is found under the epidermis, in the petioles and veins of leaves and in the flower stalks.

 

iii. Sclerenchyma:  Characteristics of Sclerenchyma are as follows:

Cells elongateq and the ends are pointed.

Cell walls being lignified become thick and the thickness is uniform.


Mature cells are dead and without nucleus and protoplasm.

In transverse section they are polygonal. Functions:

To give mechanical strength to different organs of the plant is the main function.

Some dead cell may store excretory substances of plants. Sometimes it forms hard outer wall to protect the inner soft portion, e.g. seeds of coconut and date-palm

 

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