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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
Distinguish between Simple epithelium and compound epithelium
Name one place in living organisms where the following tissue is located:
Ciliated epithelium
Give structure, types and functions in brief of the following:
Epithelial tissue
Name the tissues found:
in the testes and ovaries.
Answer the following question.
Describe different types of cell junctions.
State whether true or false. If false, correct the statement.
Epithelial tissue is protective tissue in animal body.
Prevention of substances from leaking across the tissue is provided by ______.
What is an epithelium? Enumerate the characteristic features of different epithelia.
Which is not a function of epidermis?
Write true (T) or false (F)
Epithelial cells have a lot of intercellular spaces.
Differentiate between sclerenchyma and parenchyma tissues. Draw well labelled diagram.
______ epithelium is seen in sweat glands.
Assertion: Materials are exchanged between epithelial and connective tissues by diffusion.
Reason: Blood vessels are absent in epithelial tissue.
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.
Which one of the following types of cell is involved in making of the inner walls of blood vessels?
