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Q3(a):
Define the following terms: (a) aestivation
Solution :
Definition and Theoretical Foundation
Aestivation is defined as the mode of arrangement of sepals or petals in a floral bud with respect to the other members of the same whorl. It is a critical taxonomic feature used to classify angiosperms based on the spatial orientation of the perianth segments during the pre-anthesis stage. [Per botanical classification principles for the family Fabaceae, Solanaceae, and Liliaceae].
Primary Types of Aestivation
The morphology of aestivation is categorized into four distinct structural patterns:
- Valvate: When sepals or petals in a whorl just touch one another at the margin, without overlapping (e.g., Calotropis).
- Twisted: If one margin of the appendage overlaps that of the next one and so on (e.g., China rose, lady's finger).
- Imbricate: If the margins of sepals or petals overlap one another but not in any particular direction (e.g., Cassia and Gulmohur).
- Vexillary (Papilionaceous): In pea and bean flowers, there are five petals; the largest (standard) overlaps the two lateral petals (wings), which in turn overlap the two smallest anterior petals (keel).
Visual Representation of Aestivation Patterns
Comparative Analysis Table
| Type | Overlap Pattern | Example |
|---|---|---|
| Valvate | No overlap | Calotropis |
| Twisted | Regular, unidirectional overlap | Hibiscus |
| Imbricate | Irregular overlap | Cassia |
| Vexillary | Complex overlapping sequence | Pisum sativum |
Final Solution: Aestivation is the specific spatial arrangement of sepals or petals within a floral bud, serving as a diagnostic morphological characteristic for plant identification.
More Questions from Class 11 Biology Morphology of Flowering Plants EXERCISES
- Q1: How is a pinnately compound leaf different from a palmately compound leaf?
- Q2: Explain with suitable examples the different types of phyllotaxy.
- Q3(b): Define the following terms: (b) placentation
- Q3(c): Define the following terms: (c) actinomorphic
- Q3(d): Define the following terms: (d) zygomorphic
- Q3(e): Define the following terms: (e) superior ovary
- Q3(f): Define the following terms: (f) perigynous flower
- Q3(g): Define the following terms: (g) epipetalous stamen
- Q4(a): Differentiate between (a) Racemose and cymose inflorescence
- Q4(b): Differentiate between (b) Apocarpous and syncarpous ovary
- Q5(i): Draw the labelled diagram of the following: (i) gram seed
- Q5(ii): Draw the labelled diagram of the following: (ii) V.S. of maize seed
- Q6: Take one flower of the family Solanaceae and write its semi-technical description. Also draw their floral diagram.
- Q7: Describe the various types of placentations found in flowering plants.
- Q8: What is a flower? Describe the parts of a typical angiosperm flower.
- Q9: Define the term inflorescence. Explain the basis for the different types inflorescence in flowering plants.
- Q10: Describe the arrangement of floral members in relation to their insertion on thalamus.
CBSE Solutions for Class 11 Biology Morphology of Flowering Plants
Chapters in CBSE - Class 11 Biology
- The Living World
- Biological Classification
- Plant Kingdom
- Animal Kingdom
- Anatomy 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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