Question

'Aristotle's lantern' is connected with
A. Respiration
B. Mastication
C. Excretion
D. Support

Answer 1

Hint: The mouth of most 'sea urchins' is composed of five calcium carbonate teeth or jaws, with a fleshy, tongue-like structure inside. The whole biting organ is known as 'Aristotle's lantern'.Aristotle's lantern is a perplexing plan of muscles and calcareous teeth and plates shaping an eversible organ in many echinoids, working in mastication. The mouth, on the underside of the body of the sea urchin, has an intricate dental contraption called as Aristotle's lantern, which additionally might be venomous. The teeth of Aristotle's lantern are regularly expelled to scratch algae and other food from rocks, and a few urchins can unearth concealing spots.

Complete answer:
Sea urchin, any of around 950 living types of prickly marine invertebrate creatures (class Echinoidea, phylum Echinodermata) with a globular body and a radial plan of organs, appeared by five groups of pores running from mouth to anus over the test (inner skeleton). The pores oblige tube feet, which are thin, extensible, and frequently sucker-tipped. From knobs on the test emerge long, portable spines and pedicellariae (pincerlike organs); these structures may have poison organs. The mouth, on the underside of the body, has an intricate dental contraption called Aristotle's lantern, which likewise might be venomous. The teeth of Aristotle's lantern are regularly expelled to scratch green growth and other food from rocks, and a few urchins can uncover concealing spots in coral or rock—even in steel.They live on the sea depths, typically on hard surfaces, and utilize the cylinder feet or spines to move about. What's more, a couple of predatory animal varieties have been depicted.

So, the correct answer is option B.

Note:
1) Tube feet help in breath in echinoderms.
2) Aristotle's lantern is a dental device which is utilized in mastication/biting/scratching food off rocks.
3) In echinoderms, discharge is brought out through diffusion from the body tissues to the coelomic liquid from where the excreta is disposed of through the anus.
4) The endoskeleton of echinoderms which is made of calcareous ossicles offers support.