Question

Conchology is the study of
(a)Shells of molluscs
(b)Crabs
(c)Chitin or arthropod
(d)Mantle of Mollusca

Answer 1

Hint: The calcareous exoskeleton covering which protects soft parts of animals like a snail, clams, etc of the phylum. They belong to the largest marine phylum. Their exoskeleton is used as a decoration item.

Complete answer:
Malacology is the scientific study of molluscs as living organisms whereas the study of molluscs shells is conchology. Most molluscs have shells consisting primarily of calcium carbonate set in the protein matrix. The calcareous shell is secreted by the mantle and is lined by the three layers.

Additional Information: -Mollusca is the second largest phylum after the phylum arthropods.
-The calcareous shell has three layers:
Periostracum layer-the outer organic layer helps to protect inner layers from boring organisms
Prismatic layer- this is densely packed prisma of calcium carbonate
Nacreous layer- it surrounds foreign objects to form pearls in some Molluscs.
-Most of the molluscs are dioecious and some are hermaphroditic.
-mollusc is further divided into classes- Polyplacophora, Aplacophora, Polyplacophora, Gastropoda, Bivalvia, scaphopods and Cephalopoda.

So, the correct answer is, ’ Shells of Mollusca.’

Note: -Mollusca is herbivorous or predaceous carnivores, filter feeder or detritus feeders, and parasites in nature.
-Most of the molluscs have well-developed head ends with sensory structures including photosensory receptors which will be simple light detectors or complex eyes.
-The presence of radula is a rasping, protrusible feeding structure found in most molluscs.