Quiz on Pearl Formation in Mollusks

In Which class of mollusks natural pearl formation takes place?

• Gastropoda

• Cephalopoda

• Pelecypoda

• Amphibia

What is the main function of a pearl in mollusks?

• Attraction of mates

• Food storage

• Defense against irritants

• Buoyancy control

What triggers the start of natural pearl formation in mollusks?

• Lack of calcium

• Entry of an irritant

• Exposure to sunlight

• High salinity

Which of the following is the main chemical component of pearls?

• Silica

• Calcium carbonate

• Sodium chloride

• Iron oxide

How do pearl-producing mollusks primarily obtain their food?

• By hunting prey

• By absorbing nutrients from water

• By filter feeding

• By parasitism

Which layer of the mantle secretes nacre?

• Connective tissue layer

• Ciliated epithelium layer

• Nacreous gland

• Shell lining

Which of the following correctly lists the shell layers from outermost to innermost?

• Prismatic Layer → Periostracum → Nacreous Layer

• Nacreous Layer → Prismatic Layer → Periostracum

• Periostracum → Prismatic Layer → Nacreous Layer

• Periostracum → Nacreous Layer → Prismatic Layer

What role does the ciliated epithelium layer play in the mantle?

• Formation of pearls

• Providing hardness to the shell

• Structural support

• Aiding in the movement of water and particles

How many distinct layers does the mantle consist of?

• Two

• Four

• Three

• One

How long does it typically take for a pearl to form naturally?

• Few days

• Few weeks

• Few months

• 3–4 years