7 Plant Tissue

 

Plant Tissue

-Tissue : The group of cells of similar origin structure and function is called tissue.

(a) Meristematic tissue.

-Growing regions of the plants are called meristem.

-The tissue has capability of cell division

-It grows and constitutes the different parts of the plant and this process continues till the life span of the plant.

(b) Specific features of Meristematic Tissue

-It is round oval or multi -sided

-wall is thin and cytoplasm is homogenous.

-Lack of inter cellular spaces between the cells.

-Cell contains dense cytoplasm and a single large nucleus.

(c) Apical Meristem

-Found in the Rooty and stem apex.

-Initial growth of the plant takes place due to these tissues.

-3 types: (i) parenchymal

(ii) Collenchyma and

(iii) sclerenchyma.

(d) Lateral Meristem

-Growth in the girth of roots and stem takes place due to division in lateral meristem tissue.

-So it increase the width of root and stem.

(e) Intercalary Meristem

-Plants length increases due tot he division of this tissue.

-It is important for those plants whose apex parts are eaten by  vegetarian animals 

-The apex part of the plant grows with the help of intercalary meristem.

Example : Grass.

(f) Permanent Tissue 

-It is made up of those mature tissues that have lost their capacity of division and have attained definite forms of various works.

-These cells can be dead or alive.

-Simple Tissue: It contains similar type of calls.

-Complex Tissue: It contains on or more types of cells.

-Xylem : This is usually called wood. This is a conducting tissues . Its two main functions are 

(i) conduction of water and minerals and 

(ii) To provide mechanical consistency.

-Phloem : This is a conducting tissue. Conduction of foods prepared by the leaves to different parts of the plant is its main function.