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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 one place in living organisms where the following tissue is located:
Ciliated epithelium
Name any one body part where ciliated epithelium is found in humans. What is its function?
Name the tissues found
at the outer layer of skin.
Name any four important functions of epithelial tissue and provide at least one example of a tissue that exemplifies each function.
Fats are stored in human body as
Nerve cell does not contain
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)
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 is permeable layer.
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.
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.
______ epithelium is seen in sweat glands.
Explain simple epithelium and its types.
Stratified epithelial cells have limited role in secretion. Justify their role in our skin.
Match List I with List II.
| List I | List II |
| A. Mast cells | I. Ciliated epithelium |
| B. Inner surface of bronchiole | II. Areolar connective tissue |
| C. Blood | III. Cuboidal epithelium |
| D. Tubular parts of nephron | IV. specialised connective tissue |
Choose the correct answer from the options give below:
