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प्रश्न
Give reasons for
Intercellular spaces are absent in sclerenchymatous tissues.
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उत्तर
Sclerenchyma cells have lignified cell walls which makes them compact and leaves no intercellular spaces.
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संबंधित प्रश्न
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.
What is an epithelium? Enumerate the characteristic features of different epithelia.
Fats are stored in human body as
A long tree has several branches. The tissue that helps in the side ways conduction of water in the branches is
Write true (T) or false (F)
The lining of blood vessels, lung alveoli and kidney tubules are all made up of epithelial tissue.
Write true (T) or false (F)
Epithelial layer does not allow regulation of materials between body and external environment.
Assertion: Materials are exchanged between epithelial and connective tissues by diffusion.
Reason: Blood vessels are absent in epithelial tissue.
The body of sponges does not possess tissue level of organisation though it is made of thousands of cells. Comment.
How does a gap junction facilitate intercellular communication?
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. ______ |
