The Question is from neet-zoology animal-kingdom echinodermata, and it was created by the author A SUBRAMANYAM

Question

The unique water vascular system in Echinoderms is primarily involved in all of the following EXCEPT:

A SUBRAMANYAM · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Echinoderm Water Vascular System
 **Related Topics**: Echinoderm anatomy, physiology, locomotion, respiration, excretion
 **Prerequisites**: Basic understanding of invertebrate anatomy and physiology.
## SOLUTION PATHWAY
**Given Information**:
The question asks to identify the function NOT performed by the water vascular system in echinoderms.
**Method & Steps**:
The water vascular system in echinoderms is a hydraulic system used for a variety of functions. It's composed of a network of canals and tube feet that are filled with water.
1. **Locomotion**: The water vascular system powers the tube feet, enabling movement and attachment to substrates. 
  Reasoning: Tube feet extend and contract by hydraulic pressure changes within the system.
2. **Food Capture**: Tube feet are used to capture and manipulate food particles in some echinoderms.
  Reasoning: The pressure changes allow for gripping and bringing food to the mouth.
3. **Respiration**:  Gas exchange (oxygen uptake and carbon dioxide release) can occur through the tube feet's thin walls.
  Reasoning: The thin walls facilitate diffusion of gases between the water in the system and the surrounding environment.
4. **Excretion of nitrogenous wastes**: This is NOT a primary function of the water vascular system.  Echinoderms primarily excrete nitrogenous waste through other means, such as diffusion across body surfaces or specialized organs.
  Reasoning: The water vascular system's primary role is hydraulic.
 3. **Final step**:
  Result: The water vascular system is not primarily involved in excretion of nitrogenous wastes.
  Verification:  Reviewing the functions of the other organ systems in echinoderms confirms this. 
 ## OPTION ANALYSIS
A ✓: Locomotion is a primary function.
B :x: Excretion of nitrogenous wastes is NOT a primary function of the water vascular system.
C :x: Food capture is a function of the water vascular system.
D :x: Respiration is a function of the water vascular system.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the functions of the water vascular system with those of other echinoderm systems (e.g., digestive, excretory).: Focus on the hydraulic nature of the water vascular system.
  2.Overlooking the role of diffusion in other aspects of echinoderm physiology.:  Understand that some functions, like excretion, rely on processes beyond the water vascular system.
 **Quick Tips**:
  1.Remember the key functions: locomotion, feeding, respiration. These are all powered or aided by the water vascular system.
  2.Think “hydraulic system”: The water vascular system is primarily a hydraulic system for movement and manipulation, not waste processing.

A SUBRAMANYAM · Answer

Locomotion

A SUBRAMANYAM · Answer

The correct Option is "Excretion of nitrogenous wastes"

A SUBRAMANYAM · Answer

Food capture

A SUBRAMANYAM · Answer

Respiration

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