Question

match the structure with its function in echinoderms:
ampulla
madreporite
pedicellariae
spines
tube feet
controls the entry of water into the water vascular system small, pincer - like structures for defense and cleaning
extensions used for movement and feeding balloon - like structures that control tube feet movement
part of the skeleton used for protection

Explanation:

• Ampulla: These are balloon - like structures. Their function is to control the movement of tube feet. This is because the ampulla works in the water vascular system of echinoderms to regulate the extension and retraction of tube feet.
• Madreporite: It is a sieve - like structure. Its main function is to control the entry of water into the water vascular system. It acts as a valve - like structure for water intake.
• Pedicellariae: These are small, pincer - like structures. They are used for defense (to ward off small predators or parasites) and cleaning (to remove debris from the body surface of the echinoderm).
• Spines: Spines are part of the endoskeleton (skeleton) of echinoderms. Their function is protection, as they can deter predators by their presence and physical structure.
• Tube feet: These are extensions of the echinoderm's body. They are used for movement (like in starfish for locomotion across the seabed) and feeding (for example, in some echinoderms to capture food particles or prey).

Answer:

• Ampulla - Balloon - like structures that control tube feet movement
• Madreporite - Controls the entry of water into the water vascular system
• Pedicellariae - Small, pincer - like structures for defense and cleaning
• Spines - Part of the skeleton used for protection
• Tube feet - Extensions used for movement and feeding