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प्रश्न
The body of sponges does not possess tissue level of organisation though it is made of thousands of cells. Comment.
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उत्तर
Though all members of Animalia are multicellular, all of them do not exhibit the same pattern of organisation of cells. For example, in sponges, the cells are arranged as loose cell aggregates, i.e. they exhibit the cellular level of organisation. Some division of labour (activities) occurs among the cells. Hence, the body of sponges does not possess a tissue level of organisation.
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संबंधित प्रश्न
Write the name of the following tissue.
Tissue lining the inner surface of the mouth.
Name the tissues found
at the outer layer of skin.
Answer the following question.
What is cell junction?
Lining of small intestine is made up of ______.
State whether true or false. If false, correct the statement.
Epithelial tissue is protective tissue in animal body.
What is an epithelium? Enumerate the characteristic features of different epithelia.
Intestine absorb the digested food materials. What type of epithelial cells are responsible for that?
Which is not a function of epidermis?
______ epithelium is seen in sweat glands.
Glandular epithelium gives a stratified appearance.
Sieve cells have no companion cells.
Mention the type of epithelium seen in the alveoli of lungs.
Write one point of difference between
Simple and compound epithelial tissue.
Write the salient features of the compound epithelium.
Name the different cell junctions found in tissues.
Stratified epithelial cells have limited role in secretion. Justify their role in our skin.
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.
