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Q8:
What is a flower? Describe the parts of a typical angiosperm flower.
Solution :
Definition of a Flower
A flower is defined as a modified reproductive shoot of an angiosperm plant, characterized by a condensed axis, the thalamus (or receptacle), which bears four distinct whorls of floral appendages. It serves as the site for sexual reproduction, facilitating gametogenesis, pollination, and subsequent development of seeds and fruits. [Per the Botanical definition of reproductive morphology].
The Four Whorls of a Typical Angiosperm Flower
A typical angiosperm flower is organized into four concentric whorls, arranged on the thalamus from the outermost to the innermost layer:
| Whorl | Component | Function |
|---|---|---|
| 1st Whorl (Outer) | Calyx | Protects the flower in the bud stage. Consists of sepals. |
| 2nd Whorl | Corolla | Attracts pollinators via pigmentation. Consists of petals. |
| 3rd Whorl | Androecium | Male reproductive organ. Produces pollen grains. |
| 4th Whorl (Inner) | Gynoecium | Female reproductive organ. Consists of carpels/pistils. |
Detailed Structural Analysis
1. Calyx (Non-essential/Accessory Whorl)
The calyx is the outermost whorl. Individual units are called sepals. If sepals are free, the condition is termed polysepalous; if fused, gamosepalous. Their primary function is protection during the embryonic floral stage [Morphological adaptation for bud protection].
2. Corolla (Non-essential/Accessory Whorl)
Composed of petals, which are usually brightly colored to attract insects for biotic pollination. Like the calyx, they can be polypetalous (free) or gamopetalous (fused). The mode of arrangement of petals in the floral bud is known as aestivation.
3. Androecium (Essential/Reproductive Whorl)
The male reproductive part, composed of stamens. Each stamen consists of a filament and an anther. The anther is typically bilobed, with each lobe containing two thecae (dithecous). These microsporangia produce the male gametophytes, known as pollen grains [Per microsporogenesis principles].
4. Gynoecium (Essential/Reproductive Whorl)
The female reproductive part, occupying the central position. It consists of one or more carpels (pistils). Each carpel is differentiated into three distinct regions:
- Ovary: The enlarged basal part containing the placenta and ovules.
- Style: The elongated tube connecting the ovary to the stigma.
- Stigma: The receptive surface at the tip for pollen grain landing.
Final Solution: A flower is the reproductive unit of an angiosperm, comprised of a thalamus bearing four whorls: the accessory whorls (calyx and corolla) for protection and attraction, and the essential whorls (androecium and gynoecium) for the production of male and female gametes respectively.
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(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.
- 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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