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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.
Solution :
Analytical Framework: Microscopic Comparison of Dicot and Monocot Stems
To differentiate between a dicotyledonous (dicot) and monocotyledonous (monocot) stem via transverse section (T.S.), one must analyze the arrangement of the vascular tissues and ground tissue [Per the principles of plant anatomy and developmental biology].
Step 1: Diagnostic Features Table
| Feature | Dicot Stem | Monocot Stem |
|---|---|---|
| Vascular Bundle Arrangement | Arranged in a distinct ring (eustele). | Scattered throughout the ground tissue (atactostele). |
| Vascular Bundle Morphology | Conjoint, collateral, open (presence of cambium). | Conjoint, collateral, closed (absence of cambium). |
| Ground Tissue | Differentiated into cortex, endodermis, pericycle, and pith. | Undifferentiated; not divided into cortex or pith. |
| Secondary Growth | Capable of secondary growth due to intrafascicular cambium. | Absent; lacks cambium. |
Step 2: Visual Representation of Vascular Bundle Organization
Step 3: Justification of Observations
1. Observation of Vascular Bundles: If the vascular bundles (comprising xylem and phloem) are arranged in a circular ring encircling a central pith, the specimen is a dicot stem [Based on the presence of the eustelic organization]. If the bundles are distributed randomly throughout the parenchyma (ground tissue), appearing denser toward the periphery, it is a monocot stem.
2. Examination of Cambium: Under high-power magnification, observe the interface between xylem and phloem. In dicots, a layer of meristematic cells (intrafascicular cambium) exists between the xylem and phloem, classifying the bundles as 'open.' In monocots, no such cambium is present, classifying them as 'closed' [Per the functional anatomy of meristems].
3. Ground Tissue Differentiation: In the dicot stem, identify the clear demarcation between the outer cortex and the inner pith. In the monocot stem, the lack of an endodermis and pericycle means the ground tissue remains an undifferentiated mass of parenchyma.
Final Solution: The ascertainment of a monocot versus dicot stem is achieved by identifying the vascular bundle distribution—ring-like arrangement indicates a Dicot stem, while a scattered distribution indicates a Monocot stem—further confirmed by the presence (Dicot) or absence (Monocot) of a vascular cambium layer within the bundles.
More Questions from Class 11 Biology Anatomy of Flowering Plants EXERCISES
- Q1(a): Draw illustrations to bring out the anatomical difference between (a) Monocot root and Dicot root
- Q1(b): Draw illustrations to bring out the anatomical difference between (b) Monocot stem and Dicot stem
- 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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