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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

Ring Canal Radial Canal Tube Feet

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


CBSE Solutions for Class 11 Biology Animal Kingdom


Chapters in CBSE - Class 11 Biology


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