Answer:
The meristematic cells
can be .identified of the basis of the following characteristics
(i) Cell have thin cellulose wall and dense cytoplasm with
large nucleus.
(ii) Plasmodesmal
connections are more numerous among meristematic cells.
(iii) Cell
division, i.e., mitosis and its various stages are distinctly visible.
(iv) Chromosomes
of cells replicate and divide into two homologous chromatids.
All these
features contribute to open ended growth where structure is never complete in meristematic
regions.
Whereas,
cells incapable of dividing show features such as
(i) attains
particular shape, size and thickening.
(ii) Undergoes
structural and physiological differentiation.
(iii) Different
types of cell are formed such as epidermis, cortex, vascular tissues.
The elasticity is stretch
ability of the plant cells or products, e.g., rubber/latex etc.
The elastic substances can
revert back to its original form in relaxed state. e.g., stretching of
rubber.
Different pathways in
response to environment or phases of life to form different kinds of
structure is called plasticity.
The plastic substances and
phenomenon of plasticity are not reversible, i.e., irreversible, e.g.,
difference in shapes of leaves produced in air and those produced in water in
buttercup. This is also known as heterophylly.
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