(b) Meristems based on plane of division:
It includes three types of meristems:
(i) Mass meristem: In this cell division occur in all planes so that an irregular
shaped structure is formed e.g. endosperm.
(ii) Plate meristem: It is consisted of parallel layers of cell which divide anticlinally
in two planes so that a plate-like structure formed. This pattern is seen in the
development of leaf lamina
(iii) Rib meristem: In this type, cells divide at right angles in one plane. It is found in
the development of lateral roots.
16
, (c) Meristems based on function:
(i) Protoderm: It is the outermost layer of the young growing region which
develops the epidermal tissue system
(ii) Procambium: It is composed of narrow, elongated cells that give rise to the
vascular tissue system that is xylem and phloem.
(iii) Ground meristem: It consists of large, thin-walled cells which develop to
form ground tissue system that is hypodermis, cortex and pith.
Anticlinal and periclinal cell division are both different ways of cell division. Now let's
understand the difference between the two.
Periclinal cell divisions are the ones that occur parallel to the tissue or organ surface. As a
result, we get rows of cells stacked one over the other.
Anticlinal layer of cells. So, what you get is columns of cells adjacent to one another. In
simple words, anticlinal division adds more thickness and periclinal division adds length
17
, 18
It includes three types of meristems:
(i) Mass meristem: In this cell division occur in all planes so that an irregular
shaped structure is formed e.g. endosperm.
(ii) Plate meristem: It is consisted of parallel layers of cell which divide anticlinally
in two planes so that a plate-like structure formed. This pattern is seen in the
development of leaf lamina
(iii) Rib meristem: In this type, cells divide at right angles in one plane. It is found in
the development of lateral roots.
16
, (c) Meristems based on function:
(i) Protoderm: It is the outermost layer of the young growing region which
develops the epidermal tissue system
(ii) Procambium: It is composed of narrow, elongated cells that give rise to the
vascular tissue system that is xylem and phloem.
(iii) Ground meristem: It consists of large, thin-walled cells which develop to
form ground tissue system that is hypodermis, cortex and pith.
Anticlinal and periclinal cell division are both different ways of cell division. Now let's
understand the difference between the two.
Periclinal cell divisions are the ones that occur parallel to the tissue or organ surface. As a
result, we get rows of cells stacked one over the other.
Anticlinal layer of cells. So, what you get is columns of cells adjacent to one another. In
simple words, anticlinal division adds more thickness and periclinal division adds length
17
, 18
