What do echinoderms primarily use their tube feet for?

• A. Photosynthesis
• B. Respiration
• C. Locomotion and capturing prey
• D. Reproduction

Answer: (C)

Verified step by step guidance

1. Understand the anatomy of echinoderms: Echinoderms are a group of marine animals that include starfish, sea urchins, and sand dollars. They are characterized by their radial symmetry and a unique water vascular system.
2. Learn about the water vascular system: This system is a network of hydraulic canals unique to echinoderms, which is used for movement, feeding, and respiration. It includes structures such as the madreporite, stone canal, ring canal, radial canals, and tube feet.
3. Explore the function of tube feet: Tube feet are small, flexible, and hollow appendages that extend from the body of echinoderms. They are part of the water vascular system and are used primarily for locomotion and capturing prey.
4. Consider the mechanism of tube feet: Tube feet operate through hydraulic pressure. Water is pumped into the tube feet, causing them to extend and adhere to surfaces. This allows echinoderms to move and manipulate objects, aiding in feeding and interaction with their environment.
5. Clarify the primary uses of tube feet: While tube feet can assist in respiration by facilitating gas exchange, their main functions are locomotion and capturing prey. They allow echinoderms to move across the ocean floor and grasp food items effectively.