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Q12:
Name the regions in which parenchyma tissue is present.
Solution :
1. Anatomical Definition & Theoretical Foundation
Parenchyma is a type of simple permanent tissue composed of relatively unspecialized living cells with thin cell walls made of cellulose. It serves as the fundamental structural tissue of plants, facilitating metabolic activities, storage, and photosynthesis. [Per the Cell Theory and Plant Histology, parenchyma represents the 'ground tissue' or 'filler tissue' of the plant body].
2. Distribution Mapping of Parenchyma
Parenchyma is ubiquitously distributed throughout the plant body. Its location is strictly correlated with its specific functional adaptation (e.g., photosynthesis, storage, buoyancy).
| Region of Plant | Specific Anatomical Location | Functional Variant |
|---|---|---|
| Stem | Cortex, Pith, and Medullary rays | Storage & Support |
| Leaf | Mesophyll (Palisade and Spongy tissue) | Photosynthesis (Chlorenchyma) |
| Root | Cortex and Pith | Storage of food (Starch) |
| Aquatic Plants | Internal air cavities | Buoyancy (Aerenchyma) |
| Flowers/Fruits | Pulp and Floral parts | Storage & Structural integrity |
3. Visual Representation of Parenchyma Distribution
4. Analytical Justification of Locations
- Mesophyll: Located between the upper and lower epidermis of the leaf. These parenchyma cells contain numerous chloroplasts to maximize light absorption for photosynthesis [Chloroplast-rich parenchyma is specifically termed Chlorenchyma].
- Cortex & Pith: Located in the periphery and central regions of stems and roots. These serve as primary storage zones for nutrients such as starch, proteins, and water [Per the Principle of Plant Storage Physiology].
- Aerenchyma regions: Found in aquatic plants where large intercellular spaces exist to store air, allowing the plant to float [Adaptation to aquatic environments].
Final Solution: Parenchyma tissue is found in the cortex and pith of stems and roots, the mesophyll of leaves (where it performs photosynthesis), the pulp of succulent fruits (where it stores nutrients), and in the form of aerenchyma in aquatic plants to provide buoyancy.
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.
- Q11: Identify the type of tissue in the following: skin, bark of tree, bone, lining of kidney tubule, vascular bundle.
- 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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