Answer:
The tissue responsible for flexibility
in plants is collenchyma. The distinction of collenchyma from other permanent tissues
is given below
Or
The epithelial tissue are
classified as follows
(i) Squamous epithelium It
consists of extremely thin and flat cells forming a delicate lining, e.g., the esophagus
and lining of mouth. Skin epithelial cells arranged in many layers to prevent
wear and tear, they are arranged in a pattern of layers, the epithelium called
as stratified squamous epithelium. (1)
(ii) Cuboidal epithelium
Cells are cube-like with rounded nuclei and form lining of kidney tubule and
duct of salivary glands, where it provides mechanical support.
It also helps in absorption,
excretion and secretion. (1)
(iii) Columnar epithelium It
consists of tall cells, which are pillar-like having elongated nuclei. It is
found in inner lining of intestine and helps in absorption and secretion. (1)
(iv) Ciliated columnar
epithelium The ciliated columnar epithelium tissue contains cilia in
respiratory tract. The sec ilia move and their movement pushes the mucus
forward to clear it. This type of epithelium is thus ciliated columnar
epithelium. (1)
(v) Glandular epithelium Some-times
epithelial cells acquire additional specializations as gland cells, which can secrete
substances at epithelial surface. A portion of epithelial tissue folds in ward
and multicellular gland is formed called glandular epithelium. (1)
S. No.
Parenchyma
Collenchyma
Sclerenchyma
(i)
It
consists of relatively unspecialized cells with thin walls. The cells of this
tissue are living.
The
cells of this tissue are living, elongated and irregularly thickened at the
corners.
The
cells of this tissue are dead. They are long and narrow as the walls are
thickened due to lignin (a chemical substance which acts as cement and
hardens them).
(ii)
The
cells in this tissue contain large intercellular spaces.
There
is very little intercellular space.
The
walls of cells are so thick that there is no internal space inside the cell
and between the cells.
(iii)
It
provides support to plants and also stores food.
It
allows easy bending in various parts of a plant (leaf, stem) without
breaking. It also provides mechanical support to plants.
It
provides strength to the plant parts.
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