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Q1(a):
Draw illustrations to bring out the anatomical difference between (a) Monocot root and Dicot root
Solution :
1. Comparative Anatomical Framework
The anatomical differentiation between monocot and dicot roots is primarily defined by the arrangement of vascular bundles and the presence of secondary growth potential. The following table delineates the primary structural variances:
| Feature | Dicot Root | Monocot Root |
|---|---|---|
| Vascular Bundles | 2 to 4 (diarch to tetrarch) | Polyarch (typically > 6) |
| Pith | Small or absent | Large and well-developed |
| Secondary Growth | Present | Absent |
2. Visual Illustration of Root Anatomy
3. Step-by-Step Anatomical Derivation
Step 1: Analyzing the Dicot Root Configuration
- Stele Structure: The dicot root typically exhibits a low number of xylem and phloem bundles. The arrangement is radial, where xylem and phloem are separated by connective tissue [Per Anatomy of Angiosperms].
- Cambium Formation: In dicot roots, the parenchymatous tissue located between the xylem and phloem becomes meristematic during secondary growth, forming the vascular cambium.
- Pith: The pith is generally insignificant or entirely absent, as the xylem core often extends to the center of the root.
Step 2: Analyzing the Monocot Root Configuration
- Stele Structure: Monocots exhibit a polyarch arrangement. The number of xylem bundles usually exceeds six, leading to a larger vascular cylinder [Based on Cyto-anatomical Observation].
- Pith Functionality: Unlike the dicot root, the monocot root possesses a large, conspicuous pith consisting of thin-walled parenchymatous cells, which serves as a storage site.
- Absence of Secondary Growth: Due to the lack of a functional vascular cambium, monocot roots remain structurally consistent throughout the plant's life cycle, never thickening through lateral meristem activity.
4. Summary of Structural Divergence
The fundamental biological logic for these differences lies in the developmental trajectory of the organisms. Dicot roots are programmed for increased structural support and water transport efficiency via secondary xylem (wood) production, necessitating a limited number of primary bundles. Conversely, monocot roots prioritize radial surface area for absorption and stability without the metabolic investment of secondary thickening, necessitating the polyarch arrangement and expansive pith.
Final Solution: The primary anatomical distinction lies in the xylem arrangement (Dicot: 2-4 bundles; Monocot: >6 bundles) and the development of the pith (Dicot: small/absent; Monocot: large/well-developed).
More Questions from Class 11 Biology Anatomy of Flowering Plants EXERCISES
- Q1(b): Draw illustrations to bring out the anatomical difference between (b) Monocot stem and Dicot stem
- Q2: Cut a transverse section of young stem of a plant from your school garden and observe it under the microscope. How would you ascertain whether it is a monocot stem or a dicot stem? Give reasons.
- Q3: The transverse section of a plant material shows the following anatomical features - (a) the vascular bundles are conjoint, scattered and surrounded by a sclerenchymatous bundle sheaths. (b) phloem parenchyma is absent. What will you identify it as?
- Q4: What is stomatal apparatus? Explain the structure of stomata with a labelled diagram.
- Q5: Name the three basic tissue systems in the flowering plants. Give the tissue names under each system.
- Q6: How is the study of plant anatomy useful to us?
- Q7: Describe the internal structure of a dorsiventral leaf with the help of labelled diagrams.
CBSE Solutions for Class 11 Biology Anatomy of Flowering Plants
Chapters in CBSE - Class 11 Biology
- The Living World
- Biological Classification
- Plant Kingdom
- Animal Kingdom
- Morphology of Flowering Plants
- Structural Organisation in Animals
- Cell – The Unit of Life
- Biomolecules
- Cell Cycle and Division
- Transport in Plants
- Mineral Nutrition
- Photosynthesis
- Respiration in Plants
- Plant Growth and Development
- Digestion and Absorption
- Breathing and Exchange of Gases
- Body Fluids and Circulation
- Excretory Products and Elimination
- Locomotion and Movement
- Neural Control and Coordination
- Chemical Coordination and Integration
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