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Q3:
How useful is the study of the nature of body cavity and coelom in the classification of animals?
Solution :
1. Conceptual Foundation of Body Cavity and Coelom
In biological taxonomy, the classification of Kingdom Animalia relies heavily on the structural organization of body layers. The coelom—a fluid-filled space between the body wall and the digestive tract—serves as a primary criterion for categorizing triploblastic animals. The presence, absence, or modification of this cavity dictates the complexity of organ systems and the physiological capabilities of the organism. [Per the principles of Phylogenetic Systematics].
2. Categorization Based on Coelomic Nature
The following table delineates the taxonomic divisions established by coelomic morphology:
| Category | Definition | Representative Phyla |
|---|---|---|
| Acoelomates | Animals lacking a body cavity; space is filled with parenchyma. | Platyhelminthes |
| Pseudocoelomates | Body cavity present but not lined by mesoderm; scattered pouches. | Aschelminthes (Nematoda) |
| Eucoelomates | True coelom lined completely by mesoderm. | Annelida to Chordata |
3. Analytical Significance in Classification
The study of the coelom is instrumental for three primary reasons:
- Organ System Complexity: A true coelom allows for the independent movement of internal organs, effectively buffering them against mechanical shock. [By physiological necessity in higher taxa].
- Evolutionary Progression: The shift from acoelomy to true coelomy reflects an evolutionary advancement in the complexity of the circulatory and excretory systems.
- Developmental Pathways: The manner of coelom formation (schizocoely in Annelids/Arthropods/Molluscs vs. enterocoely in Echinoderms/Chordates) provides a clear marker for splitting bilateral animals into distinct evolutionary lineages.
4. Visual Representation of Body Plans
5. Justification of Utility
By assessing the coelom, biologists can establish a hierarchy of animal complexity. In the absence of this anatomical marker, the distinction between simple invertebrates and sophisticated vertebrates would be functionally obscured, as the coelom is the requisite space for the development of the complex hydrostatic skeleton and compartmentalized viscera. [Per the Structural-Functional Correspondence Axiom].
Final Solution: The study of the nature of the body cavity and coelom is a fundamental diagnostic tool in animal classification, as it delineates evolutionary grade, indicates the level of anatomical compartmentalization, and serves as a definitive criterion for distinguishing between acoelomate, pseudocoelomate, and eucoelomate body plans.
More Questions from Class 11 Biology Animal Kingdom EXERCISES
- Q1: What are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account?
- Q2: If you are given a specimen, what are the steps that you would follow to classify it?
- Q4: Distinguish between intracellular and extracellular digestion?
- Q5: What is the difference between direct and indirect development?
- Q6: What are the peculiar features that you find in parasitic platyhelminthes?
- Q7: What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?
- Q8: Water vascular system is the characteristic of which group of the following:
- Q9: “All vertebrates are chordates but all chordates are not vertebrates”. Justify the statement.
- Q10: How important is the presence of air bladder in Pisces?
- Q11: What are the modifications that are observed in birds that help them fly?
- Q12: Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?
- Q13: Segmentation in the body is first observed in which of the following:
- Q14: Match the following: (a) Operculum (i) Ctenophora (b) Parapodia (ii) Mollusca (c) Scales (iii) Porifera (d) Comb plates (iv) Reptilia (e) Radula (v) Annelida (f) Hairs (vi) Cyclostomata and Chondrichthyes (g) Choanocytes (vii) Mammalia (h) Gill slits (viii) Osteichthyes
- Q15: Prepare a list of some animals that are found parasitic on human beings.
CBSE Solutions for Class 11 Biology Animal Kingdom
Chapters in CBSE - Class 11 Biology
- The Living World
- Biological Classification
- Plant Kingdom
- Morphology of Flowering Plants
- 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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