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Q3(f):
Define the following terms: (f) perigynous flower
Solution :
Definition: Perigynous Flower
A perigynous flower is defined as a floral arrangement wherein the gynoecium (ovary) is situated at the center, and the other floral parts (sepals, petals, and stamens) are arranged at the rim of the thalamus at the same level as the ovary. In this configuration, the ovary is described as half-inferior.
Anatomical Configuration
The morphological transition from hypogyny to epigyny occurs through perigyny. The structural features include:
- Thalamus Structure: The thalamus (receptacle) grows upward to form a cup-shaped structure.
- Ovary Position: The ovary remains embedded in the center of this cup, maintaining a position that is neither strictly superior nor strictly inferior [Per morphological classification of floral insertion].
- Floral Whorls: The calyx, corolla, and androecium arise from the periphery of this cup.
Visual Representation of Perigyny
Comparison of Ovary Positions
| Type | Ovary Status | Floral Part Attachment |
|---|---|---|
| Hypogynous | Superior | Below the ovary |
| Perigynous | Half-inferior | At the rim of the thalamus |
| Epigynous | Inferior | Above the ovary |
Botanical Examples
Typical examples of plants exhibiting perigynous flowers include members of the Rosaceae family:
- Prunus persica (Peach)
- Rosa (Rose)
- Prunus domestica (Plum)
Final Solution: A perigynous flower is a floral structure where the gynoecium is located at the center of a cup-shaped thalamus, and the remaining floral whorls (sepals, petals, and stamens) emerge from the rim of this thalamus, resulting in a half-inferior ovary.
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(a): Define the following terms: (a) aestivation
- 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(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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