Which class contains members with aristotle\'s lantern? Echinoidea Asteroidea Cr
ID: 260574 • Letter: W
Question
Which class contains members with aristotle's lantern?
Echinoidea
Asteroidea
Crinoidea
Ophiuroidea
2
What is the opening of the water vascular system?
stone canal
radial canal
ring canal
madreporite
3
Sea star larvae are radial.
True
False
4
Which organs can be found in the arms of members of class Ophiuriodea?
stomach
gonads
ceca
none of the above
5
Which of the following is not a food habit associated with echinoderms?
filter feeding
parasitism
scavenging
predation
Echinoidea
Asteroidea
Crinoidea
Ophiuroidea
Explanation / Answer
Answer 1:- Option A- Echinoidea
Explanation:- Aristotle’s lantern is a conical structure that is formed by calcareous plates and muscles. The Aristotle’s lantern supports the teeth of Sea urchin. Sea urchins belong to class Echinoidea , hence Echinoidea is the correct answer.
Answer 2:- Option D- Madreporite
Explanation:- In the animals from the phylum Echinoderm, the water vascular system is used for locomotion, food and water transportation and respiration. The opening through which water enters the system is known as ‘madreporite’. The different canals such as stone canal, radial canal, ring canal are present in the body to direct the water flow.
Answer 3:- Option B- False
Explanation:- Like any other echinoderm, the sea star larvae starts with the bilateral symmetry rather than the radial symmetry. Metamorphosis is the process during which radial symmetry is gained.
Answer 4:- Option C- Ceca
Explanation:- Gonads are located in the disc. The stomach cavity is also located in the disc, however, ten pouches or infolds of the digestive system known as Ceca extends into the arms of organisms belonging to class Ophiuroidea.
Answer 5:- Option B – Parasitism.
Explanation:- The feeding habits of Echinoderms include scavenging, predating and filter feeding. Parasitism is not the part the feeding mechanism of Echinoderms.
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