Which of the following correctly defines “Mother-of-pearl”?
[A] An oyster which yields the pearl [B] A special large sized pearl found in Japan [C] A hard iridescent substance forming the inner layer of certain shells [D] Female individuals of certain species of shelled mollusk
Correct Answer: C [ A hard iridescent substance forming the inner layer of certain shells ]
Notes: Nacre also known as mother of pearl, is an organic-inorganic composite material produced by some mollusks as an inner shell layer; it is also what makes up the outer coating of pearls. It is strong, resilient, and iridescent.