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21.

Endoskeleton of calcareous plates is found in:

A.	Star-fish	B.	Hourse-fly
C.	Pila	D.	Cockroach

22.

Ring-canal is found in the:

A.	Digestive system of star-fish	B.	Respiratory system of star-fish
C.	Water vascular system of star-fish	D.	None of these

23.

Ring-canal is found in:

A.	Cockroach	B.	Sycon
C.	Star-fish	D.	Metridium

24.

Leathery skin is found in:

A.	Start-fish	B.	Sea-cucumber
C.	Both (a) & (b)	D.	None of these

25.

A tube foot in starfish is made up of:

A.	Sucker	B.	Ampulla
C.	Both (a) & (b)	D.	None of these

26.

A stone-canal is found in the star-fish is the part of its:

A.	Digestive system	B.	Ambulacral system
C.	Both (a) & (b)	D.	None of these

27.

Madreporite in start-fish is the opening of:

A.	Digestive system	B.	Water vascular system
C.	Both (a) & (b)	D.	None of these

28.

Sea-lillies are found in the group:

A.	Mollusca	B.	Echinodermata
C.	Arthropoda	D.	Annelida

29.

Feather-stars and snake-stars/brittle stars are members of:

A.	Echinodermata	B.	Arthropoda
C.	Mollusca	D.	None of these