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Q4(b):
Differentiate between (b) Apocarpous and syncarpous ovary
Solution :
Step 1: Theoretical Foundation of Gynoecium Architecture
The gynoecium represents the female reproductive whorl of a flower, consisting of one or more carpels. The anatomical arrangement of these carpels defines the reproductive strategy of the angiosperm. The fundamental distinction lies in the degree of cohesion among the individual carpels, denoted as either apocarpous (free) or syncarpous (fused).
Step 2: Comparative Morphological Analysis
The following table delineates the physiological and structural differences between apocarpous and syncarpous ovaries:
| Feature | Apocarpous Ovary | Syncarpous Ovary |
|---|---|---|
| Carpel Status | Carpels remain free and distinct from one another. | Carpels are fused together into a single unit. |
| Structural Integration | Each carpel possesses its own separate ovary, style, and stigma. | Ovaries are unified, though styles or stigmas may remain distinct or also fuse. |
| Developmental Outcome | Produces an aggregate fruit (e.g., Michelia, Lotus). | Produces a single unified fruit (e.g., Hibiscus, Tomato). |
| Evolutionary Trend | Considered more primitive/ancestral [Per phylogenetic studies]. | Considered more derived/advanced [Per evolutionary biology]. |
Step 3: Visual Representation of Carpellary Arrangement
Step 4: Synthesis of Morphological Significance
The distinction is biologically significant because it affects the process of pollination and subsequent seed dispersal.
- Apocarpous conditions allow each individual carpel to develop independently into a fruitlet, which is often advantageous in specific ecological niches where specialized dispersers prefer small, distinct units.
- Syncarpous conditions typically facilitate more complex internal partitioning (septa), allowing for greater specialization in seed development and structural reinforcement of the ovary wall against environmental stressors [Per Plant Anatomy principles].
Final Solution: The core difference is that in an apocarpous ovary, carpels are free (independent units), whereas in a syncarpous ovary, carpels are fused together into a unified structure.
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
- 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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