Question

‘Sea Mica’ is the common name of
A. Chiton
B. Unio
C. Teredo
D. Nautilus

Answer 1

Hint: Sea mica is the primitive elongated bilaterally balanced marine mollusc holding a mantle wrapped with eight calcareous strata. Mollusca is the second largest phylum in the kingdom Animalia and around 85,000 species have been identified.

Complete Answer:
Let us analyse the given options to find out the correct answer.
Option A: Chiton is a class of aquatic molluscs. They relate to the group Polyplacophora. They are called sea cradles or Sea mica. They possess a dorsal shell. The shell is made of many shell plates. They are seen in various components of the world. They can be seen in the warm as quiet as cold water. Therefore, this is the correct option.

Option B: Unio tortoni is a kind of medium-shaped freshwater mussel, a marine bivalve mollusc in the class Unionidae, the stream mussels. Therefore, this is an incorrect option.

Option C: Teredo is a variety of highly restricted saltwater shellfish which bore in timber and live within the holes they build. They are commonly called "shipworms," and are aquatic bivalve molluscs in the taxonomic group Teredinidae. Therefore, this is an incorrect option.

Option D: Nautilus is the common title for cephalopods of the order Nautilidae. They are the only existing members of the subdivision Nautiloidea. Therefore, this is an incorrect option.

Thus, option A) Chiton is the correct answer.

Note: Chitons are aquatic molluscs of different size in the order Polyplacophora, previously identified as Amphineura. About 940 existing and 430 fossil varieties are seen. They are also sometimes identified as "coat-of-mail shells", or sea cradles or more officially as loricates, polyplacophorans, and infrequently as Polyplacophora.