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प्रश्न
What is an epithelium? Enumerate the characteristic features of different epithelia.
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उत्तर
Epithelial tissue is sheet of cells that covers the body surface or lines the body cavity.
- Simple epithelium is single layered.
- Squamous epithelium is made of flattened cells with irregular boundaries.
- Columnar epithelium is made of column like cells with round to oval nuclei at the base.
- Ciliated epithelium has ciilia at the free end.
- Compound epithelium is made of multi-layered cells.
संबंधित प्रश्न
Describe various types of epithelial tissues with the help of labelled diagrams
Based on the following information, identify the three types of epithelial tissue in the figures given below :
| a |  |
b |  |
c |  |
(1) Cuboidal epithelium: It consists of a single layer of cuboidal cells.
(2) Columnar epithelium: It is composed of tall, cylindrical cells with oval nuclei usually placed at the base of the cells.
(3) Ciliated epithelium: It consists of cells being hair-like cilia on their free surface.
Write the name of the following tissue.
Tissue lining the inner surface of the mouth.
Name any one body part where ciliated epithelium is found in humans. What is its function?
Lining of small intestine is made up of ______.
The main function of the cuboidal epithelium is
Which is not a function of epidermis?
Nerve cell does not contain
A long tree has several branches. The tissue that helps in the side ways conduction of water in the branches is
If a potted plant is covered with a glass jar, water vapours appear on the wall of glass jar. Explain why?
Write true (T) or false (F)
Epithelial layer does not allow regulation of materials between body and external environment.
Differentiate between sclerenchyma and parenchyma tissues. Draw well labelled diagram.
Give reasons for
Intercellular spaces are absent in sclerenchymatous tissues.
______ epithelium is seen in sweat glands.
An epithelial layer does not allow the regulation of materials between the body and the external environment.
Epithelium founds in the lining of stomach and intestine is
Name the different cell junctions found in tissues.
Write the appropriate type of tissues in column B according to the functions mentioned in column A.
| Column A | Column B |
| a. Secretion and absorption | i. ______ |
| b. Protective covering | ii. ______ |
| c. Linking and supporting framework | iii. ______ |
Classify and describe epithelial tissue on the basis of structural modifications of cells.
