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Q11:
Identify the type of tissue in the following: skin, bark of tree, bone, lining of kidney tubule, vascular bundle.
Solution :
Analytical Classification of Biological Tissues
To identify the specific tissue types requested, we apply histological classification based on cellular structure, origin, and functional specialization [Per Cellular Biology Taxonomy].
| Sample/Structure | Classification | Functional Context |
|---|---|---|
| Skin | Stratified Squamous Epithelium | Protection against mechanical injury and pathogen ingress. |
| Bark of Tree | Cork (Protective tissue) | Secondary meristematic origin (phellogen) preventing desiccation. |
| Bone | Connective Tissue (Skeletal) | Structural framework and mineral storage (Calcium/Phosphorus). |
| Lining of Kidney Tubule | Cuboidal Epithelium | Absorption, secretion, and mechanical support. |
| Vascular Bundle | Complex Permanent Tissue (Xylem & Phloem) | Conduction of water/minerals and organic solutes. |
Detailed Structural Analysis
Step 1: Epithelial Tissues (Skin & Kidney Tubule)
The skin consists of Stratified Squamous Epithelial cells arranged in multiple layers to mitigate abrasion [Per Epithelial Morphology]. Conversely, the kidney tubules are lined with Cuboidal Epithelium, characterized by cube-shaped cells providing mechanical strength and necessary surface area for selective reabsorption.
Step 2: Skeletal Connective Tissue (Bone)
Bones are classified as specialized Connective Tissue. They consist of osteocytes embedded in a rigid, non-living matrix composed of calcium and phosphorus compounds [Per Histological Composition of Vertebrate Skeletons].
Step 3: Protective Plant Tissue (Bark)
The bark of a tree is formed by the Cork tissue. As plants grow older, the outer protective tissues undergo changes, and the phellogen replaces the epidermis with several layers of thick-walled cells impregnated with suberin, making them impervious to gases and water.
Step 4: Complex Permanent Tissue (Vascular Bundle)
The vascular bundle is composed of two primary tissues functioning in coordination:
- Xylem: Responsible for vertical conduction of water and dissolved minerals from roots.
- Phloem: Responsible for the translocation of food materials (photosynthates) from leaves to other parts of the plant.
Final Solution: The tissue types are: Skin (Stratified Squamous Epithelium), Bark (Cork/Protective tissue), Bone (Skeletal Connective Tissue), Lining of kidney tubule (Cuboidal Epithelium), and Vascular bundle (Complex Permanent Tissue - Xylem and Phloem).
More Questions from Class 9 Science Tissues Exercises
- Q1: Define the term “tissue”.
- Q2: How many types of elements together make up the xylem tissue? Name them.
- Q3: How are simple tissues different from complex tissues in plants?
- Q4: Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell wall.
- Q5: What are the functions of the stomata?
- Q6: Diagrammatically show the difference between the three types of muscle fibres.
- Q7: What is the specific function of the cardiac muscle?
- Q8: Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and site/location in the body.
- Q9: Draw a labelled diagram of a neuron.
- Q10(a): Name the following. (a) Tissue that forms the inner lining of our mouth.
- Q10(b): Name the following. (b) Tissue that connects muscle to bone in humans.
- Q10(c): Name the following. (c) Tissue that transports food in plants.
- Q10(d): Name the following. (d) Tissue that stores fat in our body.
- Q10(e): Name the following. (e) Connective tissue with a fluid matrix.
- Q10(f): Name the following. (f) Tissue present in the brain.
- Q12: Name the regions in which parenchyma tissue is present.
- Q13: What is the role of epidermis in plants?
- Q14: How does the cork act as a protective tissue?
- Q15: Complete the following chart:
CBSE Solutions for Class 9 Science Tissues
Chapters in CBSE - Class 9 Science
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