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Q2:
How many types of elements together make up the xylem tissue? Name them.
Solution :
1. Theoretical Definition of Xylem Tissue
Xylem is a complex permanent tissue responsible for the upward conduction of water and dissolved minerals from the roots to the other parts of the plant. Being a "complex" tissue, it is composed of more than one type of cell working together as a single unit to perform a common function [Per the biological definition of complex tissues].
2. Composition of Xylem Tissue
The xylem tissue is composed of four distinct types of elements, known as xylem elements. These components vary in their structure, function, and presence of protoplasm.
| Element Name | Functional Characteristic |
|---|---|
| Xylem Tracheids | Elongated, tube-like cells with thick, lignified walls; dead at maturity. |
| Xylem Vessels | Long, cylindrical, pipe-like structures; dead at maturity. |
| Xylem Parenchyma | Living cells that store food and assist in the lateral conduction of water. |
| Xylem Fibers (Sclerenchyma) | Dead, sclerified cells providing mechanical support to the plant. |
3. Visual Representation of Xylem Components
4. Summary of Structural Roles
- Tracheids and Vessels: These are the primary conducting elements. Vessels are more efficient at water transport due to their open ends [Reference: Botanical Anatomy of Angiosperms].
- Xylem Parenchyma: The only living component in the xylem, serving as a metabolic bridge for resource storage.
- Xylem Fibers: Provide the structural rigidity necessary to prevent vessel collapse under the negative pressure generated by transpiration [Per the Cohesion-Tension Theory].
Final Solution: Xylem tissue is composed of 4 types of elements: Xylem Tracheids, Xylem Vessels, Xylem Parenchyma, and Xylem Fibers.
More Questions from Class 9 Science Tissues Exercises
- Q1: Define the term “tissue”.
- 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.
- Q11: Identify the type of tissue in the following: skin, bark of tree, bone, lining of kidney tubule, vascular bundle.
- 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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