Q. Pearl oyster is a mollusc which belongs to class :

 1990  219 MGIMS WardhaMGIMS Wardha 2003 Report Error

Solution:

Pinctada is commonly called Indian pearl oyster. Oyster's shell secretes pearls, whenever any organism enters the shell and causes irritation. Pinctada belongs to phylum-Mollusca and class- Pelecypoda.