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51.

Number of tentacles in Hydra is:

A.	2 ? 4	B.	4 ? 10
C.	10 ? 20	D.	40 ? 50

52.

Most favourable food for Hydra is:

A.	Water-fleas	B.	Bacteria
C.	Fishes	D.	Frog tadpoles

53.

Largest nematocysts of Hydra are:

A.	Penetrant	B.	Volvent
C.	Holotrichous isorhizas	D.	None of these

54.

Nervous system of Hydra is made up of:

A.	Pelarized nerve cells	B.	Non-polar nerve cells
C.	Ganglionated nerve cords	D.	Well defined nerves

55.

Pentrant, volvent and glutinants are various kinds of:

A.	Mouth parts of mosquito	B.	Laraval stages of Ascaris
C.	Nematocysts of Hydra	D.	None of these

56.

Which of these does not occur in Hydra:

A.	Regeneration	B.	Segmentation
C.	Fertilization	D.	Mating

57.

Hydra respires with the help of:

A.	Tentacles	B.	Body surface
C.	Namatocysts	D.	Coelenteron

58.

Which of these is found in Hydra:

A.	Metabolism	B.	Metamerism
C.	Metamorphosis	D.	Sexual dimorphism

59.

An association mutually beneficial to both partners is represented by:

A.	Men and honey bee	B.	Zoochlorellae and Hydra
C.	Hydra and water fleas	D.	Farmer and earthworm

60.

Division of labour in multicellular animals means:

A.	All functions by a single cell	B.	A single function performed by various cells jointly
C.	Different functions by different cell types	D.	Similar functions by different types of cells