Question

what are the different types of meristematic tissues show their location with the help of diagram

Answer 1

different types of meristematic tissue are-

(1)Apical meristematic tissue

(2)Lateral meristematic tissue

(3)Intercalary meristematic tissue

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Answer 2

Meristematic tissues are a group of young cells that are in a continuous state of division.

These tissues are mostly found at the apices of root and shoot.

The main characteristics of cells of meristematic tissues are:
(i) They are living and thin walled
(ii) Vacuoles are few and small in size
(iii) The cells contain a dense protoplasm and conspicuous nuclei
(iv) The cells are spherical, oval or polygonal in shape
(v) They do not store reserve food material and are in an active state of metabolism.


Types of Meristems:
I. Classification based on origin and development:

On the basis of origin and development of initiating cells, meristems can be divided into three types:

(i) Promeristem or priordial meristem:
A group of young meristematic cells of a growing organ. 

(ii) Primary meristem:
These are derived from promeristem. They are present below the promeristem at shoot and root apices. These cells divide and form permanent tissues.

(iii) Secondary meristem:
It is derived from primary permanent tissues which have the capacity of division e.g. Cork-cambium, cambium of roots and inter fascicular cambium of stem


II. Classification on basis of position:

(i) Apical meristem
Several theories have been put forward to explain the activity of apical meristem:
Apical cell theory:
Histogen cell theory:
Tunica-corpus theory:

(ii) Intercalary meristem:

(iii) Lateral Meristem


III. Classification on basis of function:
On the basis of their function, meristems have been classified into three types:

(i) Protoderm meristem:

ii) Procambium meristem

(iii) Ground Meristen:


IV. Classification on basis of plane of divisions


These tissues can be divided into three types:
(i) Mass meristem:
(ii) Rib or file meristem:
The cells divide only on one plane e.g., formation of filaments in algae.
(iii) Plate meristem:
These cells divide in two planes resulting to an increase in the area of an organ e.g. Leaf formation.