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Q8:
Water vascular system is the characteristic of which group of the following:
Solution :
Identification of the Biological System
The water vascular system is a unique, complex hydraulic network consisting of a series of fluid-filled canals, which acts as the defining morphological characteristic of the phylum Echinodermata [Per the taxonomic classification systems of Linnaean hierarchy].
Anatomical Components and Functional Mechanism
The system comprises the following components, which function in a coordinated manner for locomotion, food capture, and respiration:
- Madreporite: A perforated plate that allows seawater to enter the system.
- Stone Canal: Connects the madreporite to the ring canal.
- Ring Canal: A central circular canal surrounding the pharynx.
- Radial Canals: Five canals extending into each arm (or ray) of the organism.
- Tube Feet (Podia): Extensible appendages protruding from the body wall, operated by hydrostatic pressure.
The mechanism relies on the hydrostatic pressure gradient maintained within these canals [Based on the physiological principles of hydraulics in soft-bodied marine organisms].
Visual Representation of the Echinoderm Vascular Architecture
Comparative Analysis of Related Phyla
| Phylum | Distinguishing Feature | Water Vascular System |
|---|---|---|
| Porifera | Water Canal System (Choanocytes) | Absent |
| Mollusca | Mantle and Radula | Absent |
| Echinodermata | Water Vascular System | Present |
The water vascular system is essential for the movement of these organisms across the benthic substrate and is unique to this phylum, distinguishing it from all other invertebrate groups [Reference: Animal Kingdom, NCERT Biology for Class 11].
Final Solution: The water vascular system is the characteristic feature of the phylum Echinodermata.
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?
- Q7: What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?
- 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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