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Q7:
What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?
Solution :
Theoretical Foundation: The Evolutionary Success of Arthropoda
Arthropoda is the largest phylum in the animal kingdom, comprising over two-thirds of all named species on Earth. Their dominance is a result of a highly evolved "Bauplan" (body plan) that optimizes survival, resource acquisition, and environmental adaptability.
Step 1: Structural Integrity via Exoskeleton
The presence of a chitinous, protein-rich exoskeleton serves as the primary driver for their success. [Per the principles of biomechanics and physiological protection].
- Mechanical Support: Provides rigid attachment points for muscles, allowing for complex and efficient locomotion.
- Desiccation Resistance: The waxy epicuticle layer prevents water loss, enabling arthropods to colonize arid terrestrial environments [Evidence: Adaptations for niche expansion].
- Protection: Acts as a physical barrier against predation and mechanical injury.
Step 2: Tagmatization and Physiological Specialization
The fusion of body segments into distinct functional regions known as tagmata (Head, Thorax, Abdomen) allows for modular evolution. [By the Principle of Morphological Specialization].
| Feature | Adaptive Advantage |
|---|---|
| Jointed Appendages | Increased precision in movement, feeding, and sensory perception. |
| Sensory Diversity | Advanced antennae, compound eyes, and statocysts for spatial navigation. |
| Respiratory Systems | Tracheal systems or book lungs allow for high-efficiency gas exchange independent of blood transport [Per Fick’s Law of Diffusion]. |
Step 3: Reproductive Strategy and Niche Partitioning
Arthropods exhibit high fecundity and rapid generation times, which facilitate quick genetic adaptation to changing environments. Through the process of metamorphosis, larval and adult stages often utilize different food sources, thereby reducing intraspecific competition for resources.
Visual Representation: The Arthropod Body Plan
Step 4: Ecological Versatility
Their ability to occupy virtually every biome—from deep-sea hydrothermal vents to high-altitude mountain ranges and parasitic niches—demonstrates an unparalleled phenotypic plasticity. This wide distribution minimizes the risk of total extinction during localized environmental catastrophes.
Final Solution: The status of Arthropoda as the largest animal group is fundamentally attributed to the combination of a protective, moisture-retaining chitinous exoskeleton, high-efficiency tagmatization of body segments, the development of specialized jointed appendages, and diverse, resource-partitioning life cycles that minimize intraspecific competition.
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?
- Q3: How useful is the study of the nature of body cavity and coelom in the classification of animals?
- 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?
- 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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