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31.

Shell is secreted by:

A.	Foot	B.	Mantle
C.	Osphradium	D.	Visceral mass

32.

Commercial pearls are produced by:

A.	Lamellidens and Pila	B.	Ostrea
C.	Octopus	D.	Prawn

33.

Central axis of shell of Pila is called:

A.	Columella	B.	Operculum
C.	Osphradium	D.	Ctenidium

34.

Organ of Bojanus in Pila is:

A.	Respiratory	B.	Excretory
C.	Digestive	D.	None of these

35.

Crystalline style in Lamellidens is associated with:

A.	Digestion of carbohydrates	B.	Digestion of proteins
C.	Digestion of fats	D.	Absorption of food

36.

Crystalline styles secretes which of these enzymes:

A.	Protease	B.	Amylase
C.	Lipase	D.	Phosphatase

37.

Labial palps in Lamellidens ae used for:

A.	Sensory perception	B.	Food capturing
C.	Chewing	D.	Respiration

38.

Devil-fish' is the name for:

A.	Octopus	B.	Oyster
C.	Sepia	D.	Asterias

39.

Food in mussel is collected by:

A.	Mouth directly	B.	Proboscis
C.	Gills	D.	None of these

40.

Shell of Pila has:

A.	Outer most perisotracum only	B.	Outer most periostracum and middle prismatic layers
C.	Outer most periostracum, middle prismatic layer and innermost nacreous layers	D.	None of these