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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
Describe various types of epithelial tissues with the help of labelled diagrams
Name one place in living organisms where the following tissues is located:
Squamous epithelium
Name any one body part where ciliated epithelium is found in humans. What is its function?
Name the tissues found:
in the testes and ovaries.
Answer the following question.
What is cell junction?
State whether true or false. If false, correct the statement.
Epithelial tissue is protective tissue in animal body.
The ciliated epithelium lines the______.
Name any four important functions of epithelial tissue and provide at least one example of a tissue that exemplifies each function.
Intestine absorb the digested food materials. What type of epithelial cells are responsible for that?
Which is not a function of epidermis?
Write true (T) or false (F)
Epithelial cells have a lot of intercellular spaces.
Write true (T) or false (F)
Epithelial layer does not allow regulation of materials between body and external environment.
Describe the structure and function of different types of epithelial tissues. Draw diagram of each type of epithelial tissue.
Give reasons for
Intercellular spaces are absent in sclerenchymatous tissues.
Sieve cells have no companion cells.
Write one point of difference between
Simple and compound epithelial tissue.
Explain simple epithelium and its types.
Identify the types of cell junctions that help to stop the leakage of the substances across tissue and facilitation of communication with neighbouring cells via rapid transfer of ions and molecules.
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. ______ |
