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Which of the following structures is not a component of the water-vascular system of an echinoderm?
a. Ossicles
b. Ampullae
c. Radial canals
d. Madreporites
Introduction:
Echinoderms are the ancient animals that possess marine animals. They contain a unique hydraulic system that is composed of a central ring canal. For example: star fish.
Answer to Problem 1U
Correct answer:
Ossicles structure is not a component of the water-vascular system of an echinoderm. Therefore, option a. is correct.
Explanation of Solution
Reason for the correct statement:
Echinoderm has a water-vascular system that is formed by the components such as radial canals, ampullae and madreporite. It is a unique hydraulic system that is made up of a central ring canal.
Option a. is given as “Ossicles”.
As, “the structure ossicles is not responsible for the formation of water-vascular system of an echinoderm”, is the right answer.
Hence, option a. is correct.
Reasons for the incorrect statements:
Option a. is given as “Ampullae”.
It is responsible for the formation of water-vascular system of an echinoderm. So, it is a wrong answer.
Option b. is given as “Radial canals”.
It causes the secretion of fluid through tubes in the water-vascular system. So, it is a wrong answer.
Option d. is given as “Madreporites”.
Madreporites are the components that are present in the water-vascular system of the echinoderms. So, it is a wrong answer.
Hence, options b., c., and d. are incorrect.
The water-vascular system is present in the echinoderms for the exchange of liquid through the pores in the body of echinoderms.
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