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21.

Polyps in cnidarians represent the:

A.	Asexual and trophic phase	B.	Sexual and trophic phase
C.	Only sexual phawse	D.	None of these

22.

Sexual phase in cnidarians is represented by:

A.	Medusa only	B.	Polyps only
C.	Both (a) & (b)	D.	None of these

23.

Most canidarians exhibit

A.	Polymorphism	B.	Polygynae
C.	Polyandry	D.	None of these

24.

In a polymorphic cnidarians there are:

A.	Several types of zooids distinct only morphologically	B.	Several types of zooids distinct both morphologically and physiologically
C.	Several types of zooids distinct only physiologically	D.	Only one type of zooids carrying out different functions from time to time.

25.

Hydras are:

A.	Polypoid forms	B.	Medusoid forms
C.	Both (a) & (b)	D.	None of these

26.

Nematocysts of Hydra are derived from:

A.	Ectodermal cells	B.	Endodermal cells
C.	Epitheliomuscular cells	D.	Interstitial cells

27.

Interstitial cells in Hydra form:

A.	Nematocysts	B.	Sex cells
C.	Both (a) & (b)	D.	None of these

28.

The beaded processes of sensory cells in Hydra make synapses with processes of:

A.	Nere cells	B.	Interstititial cells
C.	Epithelio-muscular cells	D.	Nutritive muscular cells

29.

Which structures in Hydra correspond to pseudopodia of Amoeba functionally?

A.	Hypostome	B.	Nematocyst
C.	Tentacles	D.	Mouth

30.

Tentacles of hydra correspond to which of these functionally:

A.	Pseudopodia of Amoeba	B.	Choanocytes of sponges
C.	Both (a) & (b)	D.	None of these