Question

Madreporite is associated with_________.
A)Water vascular system
B)Canal system
C)Blood vascular system
D)Digestive system

Answer 1

Hint: It is a type of water system specially used by echinoderms mainly sea stars and sea urchins for their locomotion of food and transportation of waste and also for respiration. This system is composed of a canal that connects a number of tube feet.

Complete answer:
Water vascular system-
The water vascular system takes parts in the locomotion of tube feet which is a characteristic feature of the echinoderms. The water vascular system consists of the hydraulic system which is present in the inner side and contains the watery fluid. This vascular system also consists of a sieve plate or a madreporite and a ring vessel also known as a water vascular ring. they all are connected by a calcified vessel known as a stone canal.
-The madreporite is situated externally to the body and helps in taking the water from outside the body.
-The water Intel the madreporite and passes to the ring vessel then to the radial canal and finally to the Tube feet.
-The tube feet now contract by the localized muscles present in the radial canal or by the contraction of ampullae, offshoots of the radial canal.
- by the contraction, the fluid-filled into the tube feet and to extend it.

Additional Information: Blood vascular system- no true circulatory system is present in the echinoderm like those found in the humans or other mammals. the blood and the fluid pump into their body by their water vascular system only which is found in all the organisms
Digestive system-echinoderms have a simple digestive system including the mouth, stomach intestine, and anus.
Canal system- The canals of the water vascular system contain -the fluid of albuminous nature. It also contains water and leukocytes.
So, the correct answer is, "Water vascular system".

Note: -the water vascular system is equally developed in all the echinoderms and usually has the same structural plan.
-In Asteroidea, madreporite is a calcareous sieve-like plate.