Chapter 2: Tissues

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Q
Tissues

Question:

Identify the type of tissue in the following: skin, bark of tree, bone, lining of kidney tubule, vascular bundle.

Answer:

1. Tissue in Skin: Squamous epithelium

Squamous epithelium forms the lining of cavities i.e. mouth oesophagus, nose, pericardium, alveoli etc. and blood vessels. It also forms the covering of the tongue and skin.

2. Tissue in bark of tree: Cork

When a plant grows older the epidermis undergoes certain changes and it is replaced by cork cells. Cork cells are dead cells. The walls of cork cells are very thick and filled with a chemical substance called suberin. Suberin makes the cells impermeable to water and gases.

3. Tissue in bone: Connective Tissue

Connective Tissues are specialized to connect various body organs. The tissues can connect bone to each other, muscles to bone, bind tissue and give support to various parts of the body by creating a packing around organs. This packing prevents the organ from getting displaced by body movement. The main function of connective tissue is binding, supporting and packing together different organs of the body.

4. Tissue in lining of kidney tubule: Cuboidal epithelium 

Cuboidal epithelium forms the lining of kidney tubules and salivary glands.

5. Tissue in vascular bundle: Complex permanent tissues 

Complex permanent tissues are made up of more than one type of cell which coordinates to perform a common function. There are two types of complex permanent tissue: Xylem and Phloem. Xylem is responsible for the transportation of water and minerals from roots to different parts of the plants. Phloem transport food prepared by leaves to other part of plants.


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