EVERYDAY SCIENCE

Detailed explanation-1: -Hint:Mollusca is the second largest phylum of the animal kingdom. They are triploblastic, coelomic animals. Some species undergo torsion. These are the animals that produce pearls by their mantle layer.

Detailed explanation-2: -Pearls Are Made By Living Animals Unlike gemstones produced deep inside the Earth, pearls are created by living creatures called mollusks. Mollusks commonly have a soft, unsegmented body and a hard exterior shell, such as a clam or snail has. These animals live in marine and freshwater habitats as well as on land.

Detailed explanation-3: -Mollusks like oysters and mussels create pearls. In the rivers which have fresh water and ponds, mussels produce pearls, while in saltwater they’re produced by oysters.

Detailed explanation-4: -Instead, a pearl forms when an irritant such as a wayward food particle becomes trapped in the mollusk. The animal senses the object and coats it with layers of aragonite ("ah-RAG-uh-nite") and conchiolin ( “KON-kee-uh-lin"). These two materials are the same substances the animal uses to build its shell.

Detailed explanation-5: -Pearl oysters are members of the phylum Mollusca and belong to the class Bivalvia. Most pearl producing mollusks are bivalves, meaning their shells have two halves connected by a hinge (like a clam), a soft body with a small foot, a byssal gland and paired gills.