Which of the following characteristics is exhibited by the water vascular system of echinoderms?

• A. It functions in locomotion through the use of tube feet.
• B. It produces digestive enzymes for extracellular digestion.
• C. It is primarily responsible for gas exchange via gills.
• D. It serves as the main circulatory system for transporting blood.

Answer: (A)

Verified step by step guidance

1. Understand the water vascular system: The water vascular system is a unique feature of echinoderms, such as sea stars and sea urchins. It is a network of fluid-filled canals used for various functions, including locomotion, feeding, and respiration.
2. Focus on locomotion: The water vascular system operates tube feet, which are small, flexible, and suction-like structures. These tube feet are powered by hydraulic pressure generated within the system, enabling movement and attachment to surfaces.
3. Eliminate incorrect options: The water vascular system does not produce digestive enzymes, as digestion in echinoderms occurs in specialized digestive organs. It is not primarily responsible for gas exchange, as echinoderms use structures like skin gills or papulae for respiration. Additionally, it does not serve as a circulatory system for transporting blood, as echinoderms lack a true circulatory system.
4. Identify the correct function: The primary role of the water vascular system is locomotion through the use of tube feet. This system allows echinoderms to move, capture prey, and interact with their environment effectively.
5. Conclude the answer: Based on the analysis, the characteristic exhibited by the water vascular system of echinoderms is its function in locomotion through the use of tube feet.