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11.

Both the gills and the lung are present in which of these

A.	Pila	B.	Lmellidens
C.	Star-fish	D.	None of these

12.

Ventral nerve cord is absent in which of these:

A.	Cockroach and other insects	B.	Earthworm and other annelids
C.	Pila and other molluscs	D.	None of these

13.

Which of these do not have a ventral nerve cord:

A.	Molluscs only	B.	Annelids only
C.	Arthropods only	D.	Molluscs and echinoderms

14.

Which of these animals lacks a ventral nerve cord:

A.	Pila	B.	Earthworm
C.	Leech	D.	Cockroach

15.

Planktonic development occurs in:

A.	Pila	B.	Earthworm
C.	Cockroach	D.	House-fly

16.

Trochophore larva is found in:

A.	Earthworm	B.	Mosquito
C.	Pila	D.	None of these

17.

Larva of Lamellidens is called:

A.	Trochophore	B.	Glochidium
C.	Bipinnaria	D.	Amphiblasula

18.

Which alrva is ectoparasite on gills of fresh water fish:

A.	Glochidium	B.	Trochophore
C.	Valiger	D.	None of these

19.

Osphradium is a sense organ found in:

A.	Pila	B.	House-fly
C.	Mosquito	D.	None of these

20.

An osphradium is:

A.	Chemoreceptor	B.	Tactile
C.	Photosensory	D.	Statoreceptor