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41.

Nervous system in form of nerve net was first studied in:

A.	Sponges	B.	Coelentrates
C.	Annelids	D.	Molluscs

42.

Archaeocyte cells are characteristically found in:

A.	Protozoans	B.	Sponges
C.	Coelentrates	D.	Helminthes

43.

Gizzard is found in the alimentary canal of:

A.	Frog	B.	Earthworm
C.	Tape-worm	D.	Round-worm

44.

Earth worms and tape-worms differ in one of the following respects:

A.	Tape-worms have segmented body but earthworms have strobilation	B.	Earthworms have segmentation but tape-worms are not longer than the tape-worms
C.	Earthworms are not longer than the tape-worms	D.	Earthworms are coelomates and tape worms are pseudocoelomates

45.

Which of the following animals uses setal for locomotion:

A.	Cockroach	B.	Earthworm
C.	Starfish	D.	Jellyfish

46.

In which of the following animals eggs develop inside cocoons:

A.	Earthworm	B.	Leech
C.	Both (a) & (b)	D.	None of these

47.

Which of the following feature is characteristic mark for identification of an arthropod:

A.	Hairs, external segmentation and 3 pairs of legs	B.	Scales, antennae and segmented body
C.	Chitinous exoskeleton, external segmentation and paired as well as jointed appendages	D.	External segmentation, pair of chelicerae and a pair of pedipalpi

48.

Which of the following arthropods are totally equatic:

A.	Crustaceans	B.	Insects
C.	Millipedes	D.	Centipedes

49.

Which of the following annelids is aquatic animal:

A.	Neanthes	B.	Pheretima
C.	Eutypheous	D.	Lumbricus

50.

Which of the following animals is terrestrial animal:

A.	Arenicola	B.	Neanthes
C.	Lumbricus	D.	None of these