4. PLANT TISSUE
• THE PLANT TISSUE IS PRIMARILY
CLASSIFIED INTO TWO GROUPS:
a. MERISTEMATIC TISSUE
b. PERMANENT TISSUE
5.
6. MERISTEMATC TISSUE AND
ITS CHRACTERISTICS
• IT IS GROUP OF CELLS WHICH REMAIN IN
CONTINIOUS STATE OF DIVISION AND HELP
IN INCREASING THE LENGTH AND GIRTH OF
THE PLANT.
CHRACTERISTICSOF MERISTEMATICTISSUE
a. SHAPE: THEY MAY BE ROUNDED , OVAL OR
POLYGONAL IN SHAPE.
b. COMPACTLY ARRANGED, NO
INTERCELLULAR SPACES.
c. ABUNDANT CYTOPLASM, LARGE
PROMINENT NUCLEUS
d. DENSE PROTOPLASM AND CONTAINS FEW
OR NO VACUOLE.
10. APICAL
MERISTEM
APICAL MERISTEM IS
LOCATED AT THE
GROWING TIPS OF THE
STEM AND ROOTS AND
INCREASE THE LENGTH
OF THE STEM OR ROOT.
IT IS RESPONSIBLE
FOR THE LINEAR
GROWTH OF THE
ORGAN.
EXAMPLE: ROOT
APICAL MERISTEM AND
SHOOT APICAL
MERISTEM.
11. LATERAL
MERISTEM
IT IS RESPONSIBLE FOR
INCREASE IN THE GIRTH OF
THE PLANT .
IT OCCURS ON THE SIDES OF
BOTH STEM AND ROOTS .
LATERAL MERISTEM IS OF TWO
TYPES
a. IN FRM OF CORK CAMBIUM
b. IN VASCULAR BUNDLES OF
DICOTS IN FORM OF VASCULAR
CAMBIUM.
ACTIVITY OF THE CAMBIUM
RESULTS IN THE FORMATION
OF SECONDRY GROWTH.
13. CELL DIFFERENTIATION
• WHEN MERISTEMATIC TISSUE TAKE UP
SPECIFIC ROLE AND LOOSE THEIR
ABITY TO DIVIDE , AS A RESULT THEY
FORM PERMANENT TISSUE.
• THIS PROCESS OF TAKING UP
PERMANENT SHAPE , SIZE AND
FUCTION IS CALLED CELL
DIFFERENTIATION.
• DIFFERENTIATION LEADS TO THE
DEVELOPMENT OF VARIOUS TYPES OF
PERMANENT TISSUE.