![Tissues
The group of cells that are similar in shape and
together are called Tissue.
Tissues are broadly classified into two types:
[1] Plant Tissue [2] Animal Tissue](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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- 1. Science Symposium On The Topic: TISSUES
- 2. Tissues The group of cells that are similar in shape and together are called Tissue. Tissues are broadly classified into two types: [1] Plant Tissue [2] Animal Tissue
- 3. Plant Tissue Meristematic Tissue The cells of this tissue are always dividing. PROPERTIES: 1)The cells are small and metabolically very active. 2)Have dense Cytoplasm and thin cell wall with prominent nucleus 3)They don’t have vacuole. They are classified into three types: 1)Apical Meristem 2)Intercalary Meristem 3)Lateral Meristem
- 4. Diagrams
- 5. Permanent Tissue Permanent Tissue The tissue formed after differentiation in Meristematic tissue is called permanent tissue. It is of two types: 1]Simple Permanent Tissue 2]Complex permanent tissue
- 7. Simple Permanent Tissue The permanent tissue which is made up of only one kind of cells is called simple permanent tissue. It is of following types: 1. Parenchyma- These are living cell with thin cell wall and are loosely packed with lots of intercellular spaces. 2. Collenchyma- These are living cells. They have irregular thickening at their cell wall and hence have less intercellular space. 3. Sclerenchyma-These are dead cells with excessive thickening at their cell wall hence have no intercellular spaces.
- 8. Epidermis Epidermis is the outermost layer of plant parts. It is usually made up of a single layer of parenchyma cells. Functions i. ii. iii. iv. It aids in protection against parasites. Small pores are present in the epidermis of leaves and are called stomata. They are necessary for exchange of gases. Epidermal cells of root increase the absorptive surface area. In desert plants, epidermis has a thick waxy coating of Cutin to prevent transpiration.
- 9. Cork A layer of lateral meristem replaces the epidermis of stem. Cells on the outside are cut off from this layer. This forms the several layer thick cork of the tree. Its cells are arranged compactly with no intercellular spaces.
- 10. Complex Permanent Tissue The tissue made up of more than one type of cells is called Complex Permanent Tissue. Its types are: 1] Xylem 2] Phloem
- 11. Xylem This tissue is responsible for the conduction of water and minerals from root to various plant parts. It consists of following elements: i. Tracheid ii. Vessels- they are tubular structure iii. iv. Xylem parenchyma- it stores food and conducts water sideways Xylem Fibres- they are mainly supportive in function
- 12. Phloem This tissue is responsible for the conduction of food from leaves to various plant parts. It consists of following elements: i. Sieve cell ii. Companion cell iii. Phloem Parenchyma iv. Phloem fibre
- 13. Diagrams
- 15. Epithelial Tissue This tissue forms the covering of most internal organs and cavities within the body. They are generally single layer arranged on a basement membrane. Depending upon the shape of cells, they are of following types 1. Squamous 2. Cuboidal 3. Columnar 4. Ciliated Columnar 5. Glandular 6. Stratified
- 16. Connective Tissue Blood: The liquid part of blood is called plasma. It is 90% water, contains Various ions, hormones, digested food and waste materials The cellular part contains RBC(Red Blood Cells)-contains red pigment Called Haemoglobin, WBC(White Blood Cells)-fight against diseases and Blood Plateletsresponsible for clotting. Bones and Cartilage Tendon and Ligament Areolar and Adipose
- 17. Muscles S. No. Striated Non-Striated Cardiac 1 Muscle cells have alternate dark and light bands called Striations. Muscle cells do not have any striations. Striations are prominent but not very prominent. 2 Cells are unbranched, multi-nucleated with blunt ends. Cells are unbranched, uninucleated with tapering ends. Cells are uninucleated with blunt ends. 3 They are voluntary muscle. They are involuntary muscle. They are involuntary muscle 4 They are found in skeleton. They are found only in heart. They are found in all internal organs except heart.
- 18. Diagrams